I'll check and see if I have the same problem, and if so find a non geo blocked video that someone with better knowledge can debug with....There seems to be some problem. I can play YleAreena only 7-8 minutes at a time and then it crashes (Visual C++ runtime error). It worked fine surely at monday 22.8 when my wife watched "Miss Marple". Now I tried to play "Ontto Kruunu". After ~7minutes it crashed (logs attached). Evr.log show some paint failed messages.
I have tried few other videos too in three different PC's (Win7 and Win10) and same problems there. One time also ruutu.fi stopped playing without any errors or warnings so it might have nothing to do with areena site.
Edit: Seems if I use default renderer insted of MPAR video only stops unexpectedly without errors after 7-8 minutes.