This seem to be Xorg radeon driver bug.
Also many users experience this bug and after final release this will
damage ubuntu's fame overall, so changing to Major severity.
** Changed in: libcairo (Ubuntu)
Sourcepackagename: libcairo => xserver-xorg-driver-ati
Severity: Normal => Major
Priority: None => High
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Cairo and ATI RENDER extension cause scrambled buttons in UbuntuLooks
https://launchpad.net/bugs/34435
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