gdesklets in FC5 is older than in FC4: 4: 0:0.35.3-8.1.fc4 (FE4) 5: 0:0.35.3-8.fc5 (FE5) 6: 0:0.35.3-8.fc6 (FE6) Fix: bump FC5 and FC6 to 8.1%{?dist} or larger. I'd suggest 9%{?dist}. See also https://www.redhat.com/archives/fedora-extras-list/2006-May/msg00083.html for a recipe how to prevent issues like this in the future.
For now, I am unable to fix the issues as the PC is in repair. If it is really important, can someone fix the issue until I am able do it myself?
I noticed the python-abi is broken in each branch during a rebuild. Expect to fix the problem at the end of August.
Upgrade part issue is fixed and should not cause more problem.