Sometimes there are some abnormal colored stripes on screen when rendering.

[kiffa]

The problem happens rare.

And the color of stripes maybe white or black(depending on devices), the size of stripes is about 1/10 of the screen. The persistent  time of the strips is very short, may be 1-5 frames(a rough estimate).

Any hints?

[EgonOlsen]

Artifacts of that kind are usually caused by your code fiddling around with jPCT objects from outside the rendering thread, for example in some event listener. Make sure that you don't do that.