This is the upstream bug report for this issue. It appears to be a incompatibily issue with the newer versions of Cairo (1.12.2+) and fglrx.
I do not know if newer version of fglrx fix this cairo issue, as there is still the Radeon 12.10 driver set in the repos on both Ubuntu 12.10 and 13.04.
https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 56657
This is the upstream bug report for this issue. It appears to be a incompatibily issue with the newer versions of Cairo (1.12.2+) and fglrx.
I do not know if newer version of fglrx fix this cairo issue, as there is still the Radeon 12.10 driver set in the repos on both Ubuntu 12.10 and 13.04.