Jeremy, My issue is exactly that "Random Viewports going solid black once they'd Updated/rendered using Final Quality Renderworks" Saving, Then closing the file, reopening and then updating the viewport 9/10 times fixes the issue, occasionally I have to restart Vectorworks.....My MAC OSX is current, 10.13.6 (17G65)....This issue has been occurring since I upgraded to 2018, I don't recall having the issues with previous version...Lawrence
MAC OSX 10.13.6 (17G65), 3 GHz 8-Core Intel Xeon E5
64 GB 1866 MHz DDR3, AMD FirePro D700 6144 MB
Vectorworks 2018 SP4 Build 435714 (64 Bit)