Comment 12 for bug 710144

I can confirm this bug on Kubuntu 11.04 64-bit, upgraded from Kubuntu 10.10.

The proposed untested patch has solved the problem with the warning dialog:
...
- default)
+ default|"")
...

I don't know where the empty string session comes from, though, which seems to be the actual problem.

My x11-common version is 1:7.6+4ubuntu3.