I think I jumped the gun on @sjm0229’s problem (unless he’s having that one too, everyone is/was). Looks like some OpenGL texture related thing (I don’t know enough about it).
If he’s using 2.0 (baseline version, not latest 2.x version with patches) I remember there being the issue of textures turning black when losing OpenGL “focus”. A patch solved most of those problems.
Some searching around gave me links you might find helpful (similar problem):
Did you have this problem pre-lollipop?
That looks like the default HelloWorld scene, but did you add anything yourself? Anything to reproduce will help.