I upgraded an existing SuSE 10.0 installation to 10.1 Beta3. After the upgrade, I logged into an existing account that uses KDE as the default desktop. The task panel appeared breifly after logon, and then was automatically hidden (so far all is normal). However, moving the cursor to the bottom edge of the window failed to restore the panel! 

I discovered that under 10.1, when "Hide Automatically" is selected on the KDE Panel configuration applet's "Hiding" tab, it is now possible to specify "Raise when the pointer touches the screen's <screen-position>". In prior releases, that selection can only be made when "Allow other windows to cover panel" is chosen.

The upgrade process seems to have selected a setting other than "Bottom Edge" for <screen-position> (it was set to one of the bottom corners, I didn't write down the exact setting). Altering that selection to "Bottom Edge" restored pre-upgrade panel behavior.

I'm familiar enough with KDE to have known to right-click on the desktop and run "kcontrol" to try to restore panel operation. A less experienced user would probably have been completely stuck after this upgrade. I strongly recommend changing the default to "Bottom Edge".