This is not application specific. I have the same issue with BlocksThatMatter. I think it's a unity (or compiz) bug because the alt+tab preview of DNDCollectionWindow is the desktop! See the attached image.
** Changed in: unity (Ubuntu) Status: Invalid => Confirmed ** Attachment added: "alt-tab-bug.png" https://bugs.launchpad.net/ubuntu/+source/unity/+bug/886488/+attachment/2598001/+files/alt-tab-bug.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/886488 Title: alt+tab has problems with RevengeOfTheTitans To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/886488/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs