Ayman,

Thanks. It does seem to run (at with some initial tests) when all wrapping surfaces are deactivated. So now comes the fun part of tracking down the culprit(s). This model worked OK on 3.3; is there something about 4.1 that bogs it down with high numbers of muscles using wrapping?

Joel

Ayman, Thanks for the reply, but I am not sure this is exactly the same issue (although it may be). When the wrapping surface issue showed up, we couldn't even get any saved mot file to load into the motion slider tool (not sure what the exact technical name is). Deactivating the offending wrapping ...

James, We have had the same (or very similar) issues with Opensim 4 but it has happened on both Win and Mac versions. It also seems to depend a bit on the computer; one Win 10 machine showed the issue while another did not. I posted something about it a while back and sent in some example files but ...

Hello, We just upgraded to 4.1 and are trying things out. I have successfully scaled and run IK on one of our models, but I can't get the viewer to play back the motion. I runs OK for the first second or so (the motion is about 3 seconds in duration) but then the playback freezes and you can't chang...