I had the same issue and spent a very frustrating weekend trying to solve it, so putting this here for others. My problem was that I had an older standard install of OpenSim in the usual place (Applications/OpenSim...), which I had installed a while ago, and I had updated the OS in the meantime. Whe...

I don't think I was asked this. Don't remember about the "first time", but I installed the newest 4.0 a few days ago and it didn't ask me that. Maybe that's different on Windows vs. Mac?

I tried to get the Matlab integration running following the instructions [1]. At some point I'm asked to run a script in Matlab found in OPENSIM_INSTALL_DIR/sdk/Scripts/Matlab. However, the OPENSIM_INSTALL_DIR/sdk/Scripts/ folder seems to be missing in my installation. I do have a bunch of things in...

Yeah, I figured. I just started using OpenSim, on a Mac, so 4.0 is the only option. I wasn't aware of the github option, but I'll use that in the future. Thanks for covering this one.

I had this very frustrating problem, where the scale tool would throw an exception in the IK stage. After quite some prodding, I found that the problem came from the fact that the Time data in the .trc did not start at 0. Changing the time column in the .trc file to one that started at 0 solved the ...