I've tried running the newest versions of TPT (91.2, 91.3) on my MacBook, but every time I try to open the application, I keep getting a window that says "The Powder Toy Quit Unexpectedly." Even when I press the "Reopen" button on the window, it keeps giving me that message.
This has been massively frustrating... version 91 has had a rocky start so far, at least for OS X users...
Here's the full crash report from the OS X Window: http://pastebin.com/6XmYgF7X
And my version of OS X is El Capitan version 10.11.3