You are not logged in.
It happens when i change from one tab to another or when i close one tab and it goes automatically to another open tab.
So what actually happens is that what I see after this is both tabs kinda blended i.e. in some parts of the window (usually randomly located rectangles) i can see the previous tab and in the rest part of the window i see the new tab.
The problem can be viewed in this image.
Offline
This bug has existed on Arch since around mid-July. See https://bbs.archlinux.org/viewtopic.php?id=201587 and https://bugs.freedesktop.org/show_bug.cgi?id=91558 etc for more info.
Offline