Same thing happens here. I'm not really sure what causes this, but the program which triggers this the most is Empathy (Especially with the contacts window). And it doesn't seem to get better as updates come.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/963164 Title: windows sometimes appear invisible in spread To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/963164/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
