This may not be a cure all for every problem, but I've read a lot of problems on here that may be due to the current Kernal used for Ubuntu 8.04 and of course Ultimate Edition 1.8. I've read on the Ubuntu forums of many problems similer to some that people are having here. Last night after enabling the backports and proposed updates repos I got a rather large update. This update included the new 2.6.24-17-generic kernal. This fixed all my problems, all that I have found anyway. Firefox is even faster now. Scrolling used to be very slow and choppy but now is fast and smooth. Files copy from one folder to another without giving me and error when drag and dropping to quickly. I highly recommend updating to this kernal if you are having troubles.
---Sorry for having to edit your post ZeroPrime, but I feel it is necessary to warn of the repercussions of allowing backport updates.
People, you need to be aware of the fact that by opening up backport repositories and allowing them to offer unsupported updates to you through the update manager - you are putting yourself at risk, and if you don't know what your doing in Ultimate Edition or in *nix in general, you could be signing up for a lot of unnecessary head-aches. You won't even know that it has anything to do with the actions that you took in enabling them. You will just think and blame all these issues on Ultimate Edition or *nix in general, but the truth is that you have allowed all these unsupported and not final versions of packages to be installed on your system - and in turn have signed up to be a beta-tester of sorts for Ubuntu.
You have been warned!
DaddyX3
New Edit: The new kernal is now in the regular updates. No need to activate the proposed updates. The kernal is now in regular release.
Zero Prime