Thanks for the suggestion!
The problem seems to lie in exporting the data itself. Example files work as intended, but the ones created by exporting data from a plot into a *.sto or *.mot file are empty, and weigh 0b.

That's actually exactly what I did- and I had no problems exporting it as an .sto or .mot file, but I can't seem to get them to work in any other program than OpenSim itself.

Hello. I've recently started working with OpenSim. One of the things I wanted to do, was to gather data concerning relations between muscle fibre length and joint angles in a human arm. While GUI offers nice and intuitive ways to plot correct graphs, and to export them into formats understood by Ope...