Certain scene transition effects trigger texture malfunction

[pandamicro]

Effects affected:

• TransitionProgressRadial
• TransitionProgressHorizontal
• TransitionProgressVertical
• TransitionProgressOut
• TransitionProgressOutIn

Effect:
During transition, the out scene's render texture will encounter such issue, its texture will be filled with incorrect pixels, and more transition ran, it became worse and worse.

How to reproduce:

• Run transition effect many times (it's a probabilistic problem, not sure to be triggered)

It has been triggered once on Mac OS X