Yes, all the updtaes have been applied. I recall this problem happened around BIAB 2006/7 issue, with that in mind, I completely uninstalled BIAB and started again when I purchased 2011 - just in case. The real tracks are mostly new (purchased and downloaded in the last month or so) only the real drums are older, but as you say, the patches I have downloaded haven't helped at all. Just seems really strange that playing 'live' direct from BIAB works ok, only when I render a song is there a problem, and only then if the song has a rit. in it. If it's the same tempo all the way through the render is perfect!