Just updated the firmware and Carbide3D and have the same error on windows 10. The same files had no trouble with v3.067, so I don’t think the files are an issue. I am using Fusion 360 and have tried files output for both the Shapeoko and a generic grbl.
The offending line appears to be:
G18 G2 X310.059 Z-1 I0.317 K0
Not sure if I am using integer math or not out of Fusion 360.
Let me know, trying to get production rolling asap