I've been fighting this issue for a few months now, not sure exactly what version it started in. When MC is processing .wtv files (those recorded by WMC) it does not always release them when done. I constantly find myself looking at 'Saving tag changes (x remaining)' messages. When I run process explorer to see what is going on, the problem files or files are always in use by MC and only MC.
Right now I am looking at 'Saving tag changed (1 remaining) and when I look in process explorer I see MC currently has 3 .wtv files 'in use' and all of these are opened twice at the same time by MC (see attached).
The only way I can 'free up' these files is to completely close MC (desktop and server) and re-open.
I realize these are on the server but it also happens with files on the local machine too. When I have monitored things with WTV files in real time as I tag them in MC, I have never seen the files in use by any program other than MC and they eventually end up in this 'open twice by MC' state.
Looking to see if anyone else is using both WMC and MC and pulling their .wtv files in to MC? If you are, are you having any problems with them?