Server Version#: 1.24.2.4973 (and previous versions) Player Version#: I have a specific movie that starts in the middle of the movie. I can play it from that spot but when I stop the movie or finish it it starts in the same exact spot. It wont let me mark it as played. How do I fix this?
You might have a bad database entry for that movie. Try to Plex Dance the file.
I tried that again just now. Still now luck. 
Can you grab the xml info for that movie? Then playback that file allowing it to start from where it wants, let it play for at least 5 minutes, hit pause then stop, grab a new xml. Post both XMLs.
Do you have an android tablet device with Plex on it (or any other device)? I had one show that did this constantly. It seems I had paused playback of the show on the tablet and did not close with the “X” button. I then put the tablet to sleep. That caused the show to constantly show up as in-progress.
You can try putting a timer on “paused” sessions, under Settings > SERVER-NAME > Settings > Network. I terminate sessions paused for more than 2 hours. This may fix that problem, but I don’t know for sure. Since I had this issue happen, I’ve been religious about stopping playback on all devices since then anyway.