Hey Jim, good to hear from you :)
If there's a floating point error, I'm 99.9% sure it will be in the rectifier model. I've looked at the Cree SiC C4D02120A and it seems to be a very high VLaw parameter (81). In days of old, it was possible to add your own rectifiers to the "pool" which then ended up being incorporated into the download for PSUD2. However some of them, like this one, have values that may cause problems.
I'll look at some better parameters for this device.
Regards,
Duncan