Comment # 8 on bug 1176229 from Wolfgang Bauer

(In reply to Dirk S. from comment #7)
> < OpenGLIsUnsafe=true
> ---
> > OpenGLIsUnsafe=false

I'd assume this one is the "culprit".
Can you confirm?

But if that's the case, it would rather point to a graphics driver problem, I
think.