Here are some additional findings: The Ctree is almost definately involved. The application functions normally until I start expanding leaves. The corrution appears to be in one of the ctree functions that return a GtkCTreeNode. I'm still narrowing. I've noticed a couple reports on the bugs site, but none seem to be a match. They're probably related somehow. Matthew -- To unsubscribe: mail -s unsubscribe [EMAIL PROTECTED] < /dev/null