Comment 6 for bug 1070034

I have been experiencing this bug for quite a while in 12.04 64 bit. It occurs to me rather often, some windows remain inaccessible using arrows navigation, although it's difficult to say if there is a precise pattern or arrangement of windows that lead to the issue. However, I cannot reproduce the bug on a 32 bit install of 12.04, with the same set of compiz plugins and only slightly different options.

Any hints how to debug this? I would be very happy to provide additional info to help fix it.