I am seeing this issue with 8.0.5_GA_5839.NETWORK. One of our users has a "To or CC contains ..." filter, and the filter action is to move the message into a folder. The filter is active, and no other filters should be taking precedence over this one. Sometimes incoming messages are correctly delivered into the folder (I can see this in mailbox.log) but other times they are delivered to the user's inbox. When he manually runs the filter, it finds messages that should have been picked up by the filter, and correctly processes them. This suggests to me that the filter is not defined incorrectly, or it wouldn't work when run manually either.