When I browse through the top level menus under 3.6.0 Beta1 the highlight colour is not cleared. After clicking on any top level item (e.g. File) and then moving the cursor over the other top level menu, they all become coloured with the highlight colour (instead of reverting to the non-highlight menu colour) This occurs under Windows XP SP3 x86 en_US and pt_PT. I observed this in the official Beta1 but it is not fixed in the nightly (Build ID: 70ed7be)
*** This bug has been marked as a duplicate of bug 50136 ***