Iceweasel window control button and beryl problem

Hi! I'm having strange problem with Iceweasel and beryl. I've installed beryl with Gnome. When I run iceweasel browser and make the mouse pointer wait over any window control button(miniminze, maximize or close button) the button doesn't glow properly. I see a box with distorted images instead of showing the glow. However this doesn't happen with other windows. I mean i can open any other application window and those buttons glow fine. it happens only when i'm using iceweasel. Is it possible to help me find solution to this problem? By the way I'm using Debian Etch. Thanks.

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