For some reason, after upgrading to 11.10, the tray icon drop-down menus don't persist after a single click about 2/3 of the time. They always work if I click-and-hold, but I'm used to just clicking once to examine the menu. The behavior is not consistent, so the drop down menus will stay after click about 1 in 3 times.

I'm running 64 bit Ubuntu on a dual-monitor setup.

EDIT: from lspci:

01:00.0 VGA compatible controller: nVidia Corporation M116N (rev a2)