gtk2-2.18.3-11.fc12 contains a small patch I backported from the upstream git repo. It fixes a flaw in the GtkIconView widget that's been causing Evolution to occasionally hang when users try to open or save mail attachments. The frequency of the hang seems to depend on your desktop theme, with Clearlooks being the most problematic based on the bug reports I've seen.

GtkIconView is seldom used, and the patch was reviewed and approved by Matthias Clasen. So the risk is minimal, in my view.