Subsequent Videos in Queue Jump to End or Part Way Through
This may be triggered under other circumstances too but I've noticed it specifically when using a playlist and queue.
When the queue goes onto the next video, the video player for some (or sometimes all) people in the world (minus the master, I believe) will jump either part the way through or straight to the end of the video.
If it jumps part the way through then people need to manually force a Resync to correct it. If it jumps to the end then Resync does nothing (as the video has already ended?) so they instead need to do a Reload, but that doesn't sync the time so they then need to wait for the video to load and then issue a Resync afterwards.
In my most recent testing, almost all the videos were around 4 minutes long. During this, around 8 out of 12 the people in the world (it varied from video to video) would have to resync almost every video after the 2nd or 3rd otherwise it would start half-way through the next video.