To me the only difference between WMC and TVServer is streaming, rather than direct file playback, so maybe try unc paths instead, see https://forum.team-mediaportal.com/...tops-after-approx-20-mins.107707/#post-864075
hth
hth
Another clue maybe is that I got an error message saying "Aero was turned off" when I first booted MP weeks ago - but I dont know how to check this?