I've created a new topic because the old one was getting rather large and difficult to read through.

Current Release Version: 83.7

Download here

Version 83.7 (Build 224)

• Make PROP interface slightly easier to use (up/down shortcuts, auto select textbox)
• Add render preset buttons to render interface
• ren.decorations() to get/set decoration enable
• add a lua filesystem API
• Fix own/Fav buttons being enabled when not logged in
• official tpt++ release! This post is to big to keep using, so I moved it to a new thread

Older tpt++ Betas:

Version 83.6 (Build 220)

• There is now a mac version of tpt++
• Alt click is an alternative to middle click again
• You can edit alpha in the decoration editor
• Changing alpha and brightness will change the colors in the box to show what you really get
• Hex value displayed in the deco editor
• Icons and descriptions show in the render options ui (large empty space will be filled soon)
• Improve smudge tool

Version 83.5 (Build 214)

• History button for own saves in save browser (bottom left or right click)
• Crash fixes for searching by username
• Icons for date sort and "Show own" buttons in save browser
• Fix bug in elem.loadDefault() Lua API function, it stopped the entire API from working
• Shows number of votes on your own saves
• Enabled virtual machine, use vm.loadProgram("NAME") in lua, I still don't know how to use it
• Correctly initialize FIGH when loading and previewing saves
• Render fire in save previews better
• Fixed walls covering up fire glow

Version 83.4 (Build 213)

• Remove the TEST particle, which was accidentally included but only crashed

Version 83.4 (Build 212)

• Wall names in HUD
• Fix some bugs with energy particles in PIPE
• Version info in update prompt, change hover color of update box to orange
• Fix PRTI/PRTO graphics, debug lines only drawn in debug mode
• Fix spark color
• Minor graphical fixes to the save browser and preview
• Hidden elements in the element search
• Fix minor issues with the cursor position near the bottom and after exiting a window
• Fix using sample tool with different LIFE particles
• Save history with history:######
• Fix editing link signs (it doesn't open them with SIGN selected)
• Fix buffer overflow that may cause a crash when logged in and in other places
• Something with a virtual machine and stuff that probably isn't usable now but I have no idea

Version 83.3 (Build 211)

• Builds 209-211: Attempt to fix line/rect drawing in the zoom window. Broken in 208, actually fixed in 211
• New Lua API: Simulation
• Preserve active menu and selected tools when rebuilding menus because of lua
• Newtonian gravity shown in HUD
• Prevent using double scale on screens that are too small
• Make thumbnails a little less blurry (they are still more blurry than tpt)
• Add back view counter
• Fix line snapping from the zoom window
• Fix some issues with the tag ui
• Allow unfavoriting saves, and mass unfavoriting
• Slow down the deco tools so they are more usable
• Decoration presets can be changed (but not saved yet)

Version 83.2 (Build 207)

• Fix crash when loading tags

Version 83.2 (Build 205)

• Prevent changing sort mode when results haven't loaded
• Textbox component to lua interface API
• Fix crash when translating stamps
• Fix line snapping
• Change text for sorting buttons back to original
• Add back view counter
• Change vote bars back to the original ones
• Load tags separately from saves in search

Version 83.1 (Build 204)

• Addition to Lua API: interface
• Fix 1 pixel sized tools not working
• Add a decoration color picker
• !load command re-added for old console
• Change text for sorting buttons back to original
• Molten XXXX for lava in hud

Version 83.0 (Build 203)

• Add some missed changes from tpt version 82
• Fix some elements melting when heat simulation is disabled that shouldn't
• cold photons don't burn things
• Correct PHOT colour during fusion
• Black decoration appears on save thumbnails
• tpt.element (Lua API) can now take an element number and return a name
• Frozen and burned graphical effects for WOOD and PLNT
• New Element: DTEC, generates a spark when something with it's ctype is nearby
• Addition to Lua API: renderer (colourMode, displayMode, renderMode, plus all the macros used for Particle/display/colour modes)
• Addition to Lua API: elements (allocate, free, element, loadDefault, property, plus all the macros used for element properties, states, and menusections) (I'm not really sure what these do, I think element returns a table of that element id's properties and transitions)
• Addition to Lua API: bit (tobit, bnot, band, bor, bxor, lshift, rshift, arshift, rol, ror, bswap, tohex) http:// bitop.luajit.org/
• Fix cursor position when just outside the zoom window
• Fix streamline placement not being in the right spot

Version 82.0 (Build 202)

• This is actually tpt++, which is tpt re-written in c++
• There really isn't a changelog, since it's a new program
• It has many improvements and new features over tpt, and has almost everything tpt has
• There are some unfinished things and bugs, so it's still in beta
• Here are some improvements over tpt:
• PNG screenshots using the

  tpt.screenshot()

  Lua method
• Syntax highlighting for old console commands
• Multiple comment pages and scrolling
• Favourite/Delete multiple saves at once in save browser
• Faster/non-locking thumbnail rendering for the stamp and local save browser
• More accessible element search
• Quicker access to dedicated decoration menu
• Customizable middle click tool
• Save search won't become unresponsive on slower connections
• Text selection in text fields and labels
• Copy/Cut and Paste for text (With right click!)

Older Changes:

Version 83.0 (Build 192)

• Fix some elements melting when heat simulation is disabled
• PPIP glowing brick works even when "Glow" display mode is disabled
• Fix Air and Vac tools making air in areas outside the brush
• Cold photons don't burn things
• tpt.element (Lua API) can now take an element number and return a name
• Corrected proportions of elements during some reactions with SPNG and GEL
• Frozen and burned graphical effects for WOOD and PLNT
• New Element: DTEC, generates a spark when something with it's ctype is nearby
• SPNG and GEL can draw moisture from other water based elements (Saltwater, etc)
• SPNG absorption limit (can be used as a filter for saltwater)

Version 82.0 (Build 191)

• Fix crashes when using graphics functions with Lua
• Fix some possible but rare crashes caused by low memory situations
• Fix Energy particles not passing into PIPE correctly
• Fix issue that allowed CONV to destroy DMND
• Correct the proportions of some reactions involving water types
• Keep the zoom window visible when using undo
• Fix some bugs with the PROP interface
• You can heat/cool energy particles
• Some fixes to tpt.set_property, it now checks stacked particles too
• Fix the cut message being the same as the copy message
• Changed colours of some element buttons (WARP, TRON and Stickman)
• Ability to go back to the save preview by right clicking reload button
• More settings saved in preferences (Decorations mode, fullscreen, debug mode, ngrav_enable, and gravity lines)
• Ability to delete saves from the local saves browser
• New Element: Powered Pipe (PPIP)
• pipe can now pass into PRTI
• 1 pixel pipe can pass into an empty space, making it even faster by not clogging at the edges
• you can set ctype as a name or number in the old console
• the stamp selection area can be drawn backwards

Version 81.6 (Build 189)

• Fix zoom in decorations mode

Version 81.5 (Build 188)

• Allow Lua Key event function to override keys used by stickman and zoom
• Hide intro text when opened by PTSave link
• Added Console button to quickoptions menu

Version 81.4 (Build 187)

• Fixed issues with saving current menu (Walls is now a valid menu)
• Fixed crash when pasting long text strings
• Disable decorations in save thumbnails

Vesion 81.3 (Build 184)

• Reduced lag created by PLNT
• Optimizations to improve speed with GOL
• Added more checks for invalid elements
• Added brush size to Lua environment (tpt.brushx, tpt.brushy)
• Added brush "Alt Selected" element to Lua environment (tpt.selecteda)
• Added mouse wheel to mouse event arguments (mouseX, mouseY, mouseButton, mouseWheel)
• SALT will only melt ICE if the ICE if above salt-water freezing temperature
• Updated README and LICENSE files

Version 81.2 (Build 183)

• Fix bug in saving code when there are no signs

Version 81.1 (Build 183)

• C5 neighbouring cold insulators no longer explodes
• Fixed issue where clicking on a stack of save signs will cause an unstoppable torrent of save open windows
• Prevent acid from eating broken glass
• Stickman should no longer be able to walk on the bottom of the screen
• VOID and BHOL should eat stickman
• Reduced rate of lighting creation by CLNE
• INST can now be sparked directly using the brush
• Lightning should now be affected by gravity fields
• Remove crash when sparking INST

Version 81.0 (Build 182)

• Many things causing BHOL formation have been fixed
• Stickmen no longer fall through some powders
• Fireworks work with different gravity modes and Newtonian gravity
• Freezing point for SLTW corrected to -21.1 °C
• SING formation removed from fusion

Version 80.4 (Build 179)

• VINE grows along WOOD
• Changes to FRZZ
• Adding neutrons to EXOT makes it turn into whatever element it touches
• Improve ambient heat convection
• Clone remembers the ctype of lava (can now clone molten metal etc, instead of just molten stone)
• Compressed particles turn into BHOL

Version 80.3 (Build 177)

• New Element EXOT
• WARP element changes
• Fix some TRON flags
• TTAN only blocks pressure when adjacent to at least two more TTAN particles (or anytime with a .tmp of 1)

Version 79.5 beta:

• Fix bug where snow melted without taking its ctype into account
• Fix PROP_NEUTPENETRATE
• Add a setting to draw a wall frame around the screen
• Fix flashing dust glitch
• Fix command line save opening

Version 79.4 beta:

• Fix ptsave parsing if there is no '#'
• Download progress bar for save opening
• Soap bubbles easily formed, also their links get inherit soap's decoration color
• Don't show disabled elements in the search
• Fix saltwater boiling temp typo

Version 79.3 beta:

• Improvements to fusion
• New feature, Element search (press 'e' on the keyboard)
• Improvements to decoration editor rendering
• Fix bug with BOMB not deleting correctly
• Fix issues with new save format that cause the gravity walls to not update
• Handling of ptsave protocol so you can create links to open games in Powder toy (Game will need installing again for this to work: example
• Many other fixes that I have forgotten about.

Version 79.2 beta:

• Fix minor spelling errors
• Fix crash when using flood-fill or a lot of INST
• Fix an issue that made it impossible to change the Windows size from the options screen

Version 79.1 beta:

• Prevent changing of Window size if the screen is too small.
• Fix bug that caused pressure to leak from TTAN when pausing/framestepping
• Fix crash when opening display options

Version 79.0 beta:

• Fix a problem with GPMP that caused gravity to depend on air pressure.
• Fix TNT sometimes not exploding if multiple TNT particles are in the same place.
• Fix PUMP not generating negative pressure if it is next to a wall.
• Better colour options preview.
• New element titanium (in the solids menu), which completely blocks air and absorbs some neutrons

Version 78.1 (Build 163):

• Fix bug that created "weaponised explosive GEL"
• Changes to License (GPLv2 to GPLv3)
• Fix bug that caused thumbnail caching to not work
• Remove unused debug output of thumbnail cache
• New save format: OPS, allows saving of almost all data within the simulation
• Plasma can now travel through portals and PIPE
• Changes to GEL, will no longer absorb water when saturated
• Fix bugs when moving signs
• Fix file opening on Mac OS X
• Line snapping in the decoration editor
• Changes to SING to prevent it from exploding through walls
• Code cleanup for mouse scaling

If you have any bugs, issues or minor improvements to report, post them here, other suggestions should go in the feedback forum

@BuysDB (View Post)
That's an issue caused by the fixing of a previous bug that allowed signs with text strings longer than permitted.