See bug reports at: <https://bugzilla.redhat.com/show_bug.cgi?id=475597> <http://groups.google.com/group/gnu.emacs.vm.info/msg/9ffbc1fb20c82c8b> Looks like the problem was introduced with vm-8.0.10, by this change: <http://bazaar.launchpad.net/~hack-robf/viewmail/trunk/revision/453.6.28>
Created attachment 203854 [details, diff] vm-8.0.12-folder-corruption.patch
Fixed in -r4 (hopefully) and patch posted to gnu.emacs.vm.info: <http://groups.google.com/group/gnu.emacs.vm.info/msg/bf9071df40399967>