No files and empty archives

[TheVirus]

Sometimes when browsing from XBMC to Universal Media Server, only folders show up, but no files and rar archives that contain my movies come up emtpy. After a restart of the UMS service or sometimes the whole server, it works properly again and the movie inside the archive is displayed and can be played. However, many times it does not show any files inside the archive and therefore does not work. How can I fix this?
I cannot get a trace log unfortunately, as although I always set the logging to Trace, the service simply only produces debug log with no viable information as far as I can tell. When it happens again, I'll upload a log.

Edit: log added with trace when it didn't work (ums_dbg.zip) and when it is working correctly after a restart of the application (not running as service both of these times) (ums_dbg_working.zip)

[TheVirus]

Nobody?

[TheVirus]

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