My experience was locked files or lost shared folders (VM doesn't see them until you say the magic words, aka randomly stop and start services until it works).

My experience was locked files or lost shared folders (VM doesn't see them until you say the magic words, aka randomly stop and start services until it works). Both happened so (relatively) frequently that I just lost confidence in the feature until version 16 where read-only folders works fine. (I stopped using it in version 9)