Just to help us reproduce and debug, what sort of error are you getting when you try to open the model in the OpenSim GUI? If it's something related to "ConstantCurvatureJoint" not being supported, make sure you're on the latest OpenSim 4.5 GUI from here: https://simtk.org/projects/opensim . If this...

Feel free to hit "Force reprocess" if your job waits for more than a day. This shouldn't ever happen, but sometimes our cluster gets out of sync and jobs that think they're queued end up getting lost.

It's also worth emphasizing that Moco is a standalone tool that you can use outside of AddBiomechanics, also. The AddBiomechanics integration is just for your convenience, so you don't have to set up the problem yourself, but AddBiomechanics does require that you share the data that you upload with ...