Comment 5 for bug 931473

I'll try this patch in a moment to check if it fixes this issue.

I am able to reproduce it quite easily through right-clicks on a window's title bar. How I reproduce it:
Move your mouse tho the title bar of any application, then perform a right-click quickly followed by a left-click. Usually on the second or third try, instead of the menu I only get the menu border and shadow, with the insides transparent.

This happens quite often on my laptop - like every 2-3 sequences as I mentioned above. In normal everyday usage it's a bit more rare, but still not uncommon - I would say every 10-15 times it happens by itself.