I'm constantly getting an error (or simply nothing happens) after executing the following steps on my OpenElec installed on Raspberry Pi 2 (same happened on RPi B+ model):
Log in as a first profile (eg. master)
Launch a playback from video addon (eg. TEDTalks, Youtube). Stop playback.
Log off, log in as another profile (eg. user)
Try to launch a playback again.
From now either nothing happens, or I am getting an error message. It doesn't matter if it's the same video, or not. Plugins playing finite videos, such as TEDTalks or Youtube no longer work. However, there is no issue with streams, such as Twitch - they will be played correctly.