Problem: Sometimes when accessing the UI in your browser it may become unresponsive or fire up with a blank screen and just sit there. When it is in this state it may not receive mail either.
Solution: As noted in the release notes http://sourceforge.net/project/shownotes.php?release_id=191540 forking is disabled by default on the Windows platform.
That means the UI is not available when mail is being processed by POPFile. The result is the apparent 'freeze' you see. The UI will be usable again when the mail has been processed.