Does anyone know if this is a SW issue or a GibbsCAM issue? My first thought is that maybe we just need to wait on a GibbsCAM update, or has Solidworks stopped supporting GibbsCAM - which is something very important we would need to know asap!?
For now I'm saving my files as a Parasolid .x_t format which is still supported by GibbsCAM as my workaround.
Matthew, no issue ... They simply haven't caught up to the latest release of SW yet. Word has it that they will have a version 12.033 coming out ~11/2/2018. Otherwise you're on the right track, Parasolid format is the way to go in lieu of the .sldprt/.sldasm formats.