It's a problem in texture sizes wrongly detected by beryl.
Try to resize the window to less than 512 pixel and see.
Also launch it through command line:
and look at the maxsize of textures. Here I have 2048x2048 but a lot of cards have 512x512 which is fine but beryl then wrongly calculates the size when trying to detect GL extensions.
I have so many other bugs with beryl I don't even dare to launch it again.
never say never
I ran it again and and and.. I had not anymore problems (title bar, some windows not displayed, blue line when going into beryl-manager menu,..)
Until it broke again for no reason
That's funny.. for me I need to resize them to a higher size for the refreshing to work. Some of my windows are not refreshed at all, quite unusable.
Maybe something to do with "power of two" sizes.
Probably different among graphic cards Nv/ATI/Intel because they have different texture size (if I am not wrong about the root cause).
Okay I'll debug again this evening..