Citrix Receiver Segfaulting under Kubuntu Raring

The other weekend I updated Kubuntu through 2 releases to the latest raring.
The upgrade was a painless process - a simple do-release-upgrade or something so I thought all was merry.

Not so fast. One of the few application I use is Citrix XenApp receiver to work from home. For some reason when I clicked the icon from the web interface I was getting zero response. Zero, nada, zilch.

(I did manage to work out how to get the raw ICA file through from the citrix xenapp web interface: in firefox simply disable the Citrix receiver plugin and it pops up with the file itself which you can run through wfica manually! :) ).

I ran the program through a lot of stuff - strace, checked the ldd, valgrind, changed my window manager, and nothing fixed it! I couldn't even see the problem since the code is proprietary. Though it did seem to be happening somewhere gtk_main.

Still segfaulting.

Then I went on a bit of a rampage and deleted everything listed under `gtkorphan` which was fun but not helpful.

Then I force removed gtk3 down to 2 using: http://askubuntu.com/questions/18631/how-to-downgrade-gtk2-0-package-to-workaround-bug-693758

Then I removed the oxygen them: http://askubuntu.com/questions/177909/restore-gtk-integration-after-removing-kde

And bingo!
Not sure exactly what it was. My tests seem to indicate the oxygen theme but that wouldn't explain why it still wasn't working under xfce. So maybe it was that in combination with the gtk downgrade.

Anyway, please let me know if you face a similar problem and write a comment - I can probably help you out. This was such a difficult one to fix (without reinstalling!).

Peace out.