I've had to redo this query as the main post has been taken down.
The query was concerning the action of the playback marker when start/stopping the video and the option in settings on the behaviour when using the spacebar to start/stop playback.
When the spacebar option in settings, is selected, the behaviour is what I'm used too in that the video stops and the arrowed marker is placed at this point.
On the other hand when the option is not selected I'm sure in X12 that when the video is stopped that the video in the program monitor would display your start position i.e. where the playback marker is. On my setup in X13 when I stop my video the video stops at that position and when I restart playback the video jumps back to the start position. See video. Is this how it's supposed to be?
Don