Package Manager mis-configured in 11.1 Gnome install

I’ve just installed OpenSUSE 11.1 Gnome on my EeePC 901. The install went without problem but the subsequent configuration step errored out after just a minute or two complaining of a missing file (which unfortunately I neglected to note down).
Nevertheless, I can still readily boot into openSUSE and nearly everything (so far) seems to work fine.
However, a major exception is the Package Management system.
If I use Install Software I cannot get anything to install due to dependencies not being found. This is in spite of the dependencies being clearly available in the list of packages. At times, selecting a package for installation gives a message about a badly-formed package ID.
Add/Remove Software gives an error complaining about System Management being locked by the application /usr/lib/YaST2/bin/y2base. If I kill this process and try to open Add/Remove Software again, it starts to open but closes again almost immediately without any apparent error.
Obviously my Package Management System is badly messed up. Can anybody please advise how I can get this working?
In Add/Remove Software,