Step Sequencer problem

Hi Guys,
Has anyone come across this one yet ?
Set up an 8 bar sequence using session drummer 3 and loop it.
When it plays it back it plays the first 8 bars correctly then misses the play back on bar one and plays the remaining 7 bars and keeps on doing this in the loop.
I have tried this several times but it does this every time, anyone got any ideas?
 
Thanks in advance

Larry,
The play function is certainly stopped nothing is running except the sequencer its possibly more like a time dely between the 8th bar and the start of the loop again but the now time is set at the begining of the first bar so it should be starting the repeat immediately
Stan

I think I had this happen once but can't remember what fixed it - sorry i can't help more.