Does this happen only when you have at least one window maximised? If so, you are experiencing bug #832150. There is already a fix in oneiric-proposed, which should soon make it's way to -updates. If you want to have the fix before then, see https://wiki.ubuntu.com/Testing/EnableProposed
Does this happen only when you have at least one window maximised? If so, you are experiencing bug #832150. There is already a fix in oneiric-proposed, which should soon make it's way to -updates. If you want to have the fix before then, see https:/ /wiki.ubuntu. com/Testing/ EnableProposed