Emmanuel - changing the icon set to Tangerine does seem to clear up the problem for me. After I saw your last comment, I started checking for artifacting/corruption in menus and scrollbars and switching between Human and Tangerine icon sets. On one occasion, in gFTP, I saw what might have been some very minor corruption in one of the horizontal scrollbars. However, I've been unable to duplicate it.
My laptop (Sony VAIO PCG-GRZ610) utilizes the ATi M7 LW Mobility Radeon 7500 GPU w/32MB RAM. -- Garbled using open source Radeon driver https://launchpad.net/bugs/38198 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
