I'm a new Ardour user and also fairly new to Linux too, so be gentle with me.
I have a slight issue with looping the transport. When I set up a loop (right click on a region - play - loop region) the playback isn't smooth while the playhead returns to the start position, and the transport switches to "stop" momentarily. Event the click track will stutter as the region repeats.
I've noticed that I don't get these issue all the time. Which make it all the more irritating. I hope you geniuses can help!