I had a problem in VSL Synchron player BBO libraries. Starting playback in the middle of a note does not cause the keyswitch to be recognized by Synchron player.
I set up a simple test track where 3 consecutive notes each had an easy to identify articulation set. Play thru all 3 and all is well. Play thru 1, stop, set cursor at middle of 3 and play, and you would hear the note 1 articulation on note 3.
I tried every iteration of "play at" and "chase mode". I checked Preferences | P