Version: 1.90 (using KDE 4.1.0) OS: Linux Installed from: Ubuntu Packages When you unset the cover in Amarok 2.0 beta1, it gets automatically redownloaded in a couple of seconds so unsetting it effectively doesn't work.
Also, setting a custom cover doesn't work for this reason. Once I've set it, the old one gets redownloaded again. In addition to that just copying an URL to the "Set custom cover" opening dialog doesn't work like in 1.4 but that's probably another bug report (I'm too lazy to create at the moment).
I can confirm this.
*** Bug 171962 has been marked as a duplicate of this bug. ***
Fixed in r866607.