I’m updating from 5.5 to 5.6 but I have the same issue.
It seams to be all sequences with a particular rig in it. So I think it has to do with the control rig and not the sequence itself. It happens on a handful of my rigs and I haven’t found a common pattern why it should happen to those specifically.
The error isn’t very detailed so I can’t see which controls causes the problem.
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