As reported by Lenbok on bug 754065, this was caused by having "Keep previews of minimized windows" enabled in CompizConfig Settings Manager -> Workarounds. Closing since the reporter no longer experiences the problem and bug 754065 has much more information.
** Changed in: compiz (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/747021 Title: Can still interact with minimized windows To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/747021/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : compiz@lists.launchpad.net Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp