I just did an upgrade to KDE 4.3.1 (openSUSE 11.1, 32 bit). However, the lower panel 'broke' after I tried to add a widget/plasmoid to it.

So, I followed the instructions at the KDE-Upgrade link to try & get back to a working KDE 4.3.1 desktop:

If your desktop layout is broken after the upgrade you can reset it by running this command in Konsole:
kquitapp plasma-desktop && rm ~/.kde4/share/config/plasma-desktop* && plasma-desktop &
Now, on logging in to KDE 4, there is a blank screen, though the KDE4 Runner (fast application launcher, that is got by Alt-F2) comes up on Alt-F2.

How to get back to a working KDE 4.3.1 desktop ?