Comment 2 for bug 672275

Problems still persist with regard to quitting virtual folders.

After a folder's virtual folders have been quit, doing pretty much anything with the folder gives rise to arrayp nil error in vm-sort-compare-activity.

This is happening because some message symbols in vm-thread-list have nil for vm-th-messages, even though they have a non-nil vm-th-message. So, vm-thread-root-sym is giving nil in vm-sort-compare-thread. Where is this problem coming from?