It's pretty fast i7 16gb ram. Windows 11. After I hit stop I see the .ts file size increased. Never starts to play. I can play the .ts file from the temp directory.
In Sam's case above, it was because the VOD item wasn't downloading fast enough. It needs to be able to download at slightly faster than the playback rate to be able to watch it live, otherwise you're limited to to using the download/record option.
If you want to post your logs, I can check if its this same thing.