The problem seems to be that there is a virtual folder based on the IMAP folder. Its definition says that it is actually based on the corresponding cache-folder on the disk. So, vm-build-virtual-message-list is trying to visit that folder. Craziness!
The problem seems to be that there is a virtual folder based on the IMAP folder. Its definition says that it is actually based on the corresponding cache-folder on the disk. So, vm-build- virtual- message- list is trying to visit that folder. Craziness!