Wow, old thread. I only remember having the problem when SP1 was installed, and I'm not certain if I installed the later service packs(thought it might have had to do with my old computer, may it RIP...) . I reistalled the original VW2018 at the time, which worked fine until I updated to the 2019 version. So far, no troubles, but I've not spent much time on it since I'm starting into Z-brush and Fusion 360. I'm still using Vectorworks because it's easier/faster for me at the moment, but usage depends on assigned projects which haven't required much lately. No troubles updating or opening older files in the 2019 version.