Normally clicking on one of the triangles in the Evolution mail folder tree will show or hide the folders in an account, or a folder's subfolders. But occasionally they will stop working - all of them, for all accounts and even virtual search folders. I haven't yet noticed a pattern as to when this happens, but I'll keep monitoring. The only console error Evolution has put out this session (several times) is: (evolution:3636): GdkPixbuf-CRITICAL **: gdk_pixbuf_new: assertion `width > 0' failed But I don't see any new errors when clicking on the non-functional triangles. Restarting Evolution causes the triangles to start working again. Version: evolution-2.28.2-1.fc12.i686
*** This bug has been marked as a duplicate of bug 494712 ***