I have been having the same problem for at least a week. As I remember it started after an update on league of legends. I don't believe it has anything to do with what you have done so I think you will just have to wait until an update is released to fix it. I had files that were saved in the past which were working fine until now and wish I had recorded the bits I wanted but I'm hoping that once it has been fixed the old files will be able to run with no problem, but I might have to change the way they open the spectator mode if it is changed. But other than that all new records should work after a fix.