Did you put your temps in Celcius or Kelvin? They should be in Kelvins, so you might have to add 273.15 to your value. It shouldn't be negetive. Also, make sure you put the transition in the right spot. If you replaced a gol element, be sure to replace the right line and not the first one that says \*free*\, because the transitions table hasn't been updated in a long time.
EDIT: I still cannot get the transitions to work and I really have no idea why they aren't working. If somebody can help me it would be greatly appreciated.