I finally got to work out what caused the issue in my case. MediaInfo seems to crash if it does not have the access right to modify the file. After I gave all rights to the folder, everything worked out fine .
If that won't help you, there's still a way to disable the MediaInfo lookup in the advanced Settings of Moving Pictures. I even found out that it does not actually crash MP, furthermore it's kind of a two min delay in playback.
Ever time I start video in either moving pictures or mytvseries. If I disable moving pictures mytvseries worksFor personal interest, do the freezes happen every time you start a video file or just sometimes?