.. and I've tried previous versions and deleted the reaper.ini... this is driving me nuts. I've got a project which consistently will not render, even a realtime render without putting weird space monkey glitches over the count in click track which is played using reasynth hooked up to a simple 4-count midi clip which repeats. The really weird thing is this project plays just fine! other projects render, just fine! - even with this click track thingy! I'm running another online x1 render right now but i'll upload the project file (it's just midi) and hopefully you can see what's going on. I also had to online x1 render a live band gig recording a did a few weeks ago and thought it was just a busy project so didn't think much more about it, could be connected though? latest mac osx. Kind regards Dave Rich