Has anyone else seen this? Just since switching to 2018 I get the following: when opening the first part or assembly of a SolidWorks session (doesn't matter if I pick the file from the dropdown list or the quick access menu that opens at the start) I have to take my hand off my 3D mouse (Space Navigator) because if I move the part or assembly even a tiny bit during the loading process the whole thing becomes invisible. The feature tree is there and looks correct but nothing shows on the screen and no re-centering or toggling of views seems to bring it back. I have to close the file and reopen to make it visible. Subsequent openings are fine. But if I restart SW the problem recurs. Minor problem, yes, but unnerving.

System diagnostics shows all systems with green check marks.