This just in from Tech support
We’ve had a couple similar reports, so we may want to try resetting your Runtime Cache in Vectorworks. We can do this by deleting the RuntimeCache folder in your Users folder; I’m listing the locations below for both Mac and Windows.
Windows | C:\Users\ ( Your Username ) \AppData\Roaming\Nemetschek\Vectorworks\2018\Plug-ins\RuntimeCache
Macintosh | HD > Users > (User's Home Folder) > Library > Application Support > Vectorworks > 2018 > RuntimeCache
I hope that helps! Please keep me posted, and have a great day!