Seqplayer missing beats

Jussy's icon

Hi,
I am just exploring Eric Singer's potentially wonderful SeqPlayer, but I am getting a problem with delys as I switch between locations of my MIDI file using the Goto message. Sometimes it just jumps cleanly, but more often it will "eat" a couple of Bang before picking up a couple of Bangs later than my requested Goto point. I suspected the Countoff message, but even setting it to 0 does not solve the problem.
I am sure this must be something easy and silly!
Any advice?