I have looked on the offical Blender site and I haven’t found any links to bug reporting, and neither did I see this here, so I guess I post it here and hope that somebody can point me in the right direction.
I’m running Blender 2.40 on Radeon 9800XT, P4 2.0 GHz 1GB RAM.
When I switch into face select mode with the FKEY, then some of my menubars dissapear. You can see this on the screenshot below. The main menu bar and the invidiual for the upper views are gone.
When I move the mouse around the menubars are coming and going as you can see on this other screenshot. Here some of them are there again, while others dissappeared instead. The flickering seems to happen whenever I cross over a view boundary into the other.
this problem happens only in face select mode. At least I haven’t seen it in other modes that I used. I also restarted Blender and it persists whenever I go to face select. When I brush with the mouse over the gone menubars, the individual items refresh and are usuable, so it seems to be a drawing problem. I didn’t have this problem with 2.73a.
The scene is pretty simple, but I can provide the Blenderfile, in case it might help.