I’m afraid I don’t know a whole lot about the technology involved and therefore what to try next. I’d really appreciate it if someone could help with this!
The log you enclosed looks okay. I’d have to see a log from when it stopped working, but based on the timeframe, it sounds like its having a problem when scanning. My guess would probably be a virus scanner thing. Sometimes they stop the server from being able to access the database.
The 1.1 beta on Roku’s site (http://www.rokulabs.com/forums, in the firefly forum), or the nightlies at http://nightlies.mt-daapd.org should have a version that works around the virus scanning problem (assuming that’s the problem). Try installing that.