Maybe another taint caused by the dropdownmenu bug.
There is another bug that is related to the dropdownmenu. If you leave combat in a group it will spit out that CompactUnitFrame or CompactRaidFrame was tainted without any addon actually touching that part of code.
Maul posted (
http://www.wowinterface.com/forums/s...38&postcount=2) that he could track down the message for using the dropdownmenu.
Maybe your issue has to do with the dropdownmenu aswell. (Since you use the dropdown to inspect)
So atm it may be possible that using the dropdownmenu at all nets us random taints.