Hi Jim,
Apologies for the time lag, I'm in Sydney.
I'm running Vectorworks 2019 SP2 build 463397 FAR on a iMac Pro (2017) 3.2 GHz Intel Xeon W, 32 GB 2666 MHz DDR4 Radeon Pro Vega 56 8176 MB.
Here are a few of the issues I'm encountering, most of them seem to relate to Navigation & Graphics however generally there are multiple glitches that occur randomly and I'm finding that VW is running noticeably slower than on my old iMac.
Plane modes are unreliable:
Rotating Plan doesn't hold reliably when when shifting between standard views:
Screen won't scroll properly:
Slight lag and hanging when using the walk-through tool in Open GL:
I was told by my Service Select tech support person to change preferences from Best to Good Performance & Compatibility which made a slight difference but not a significant one.
I reverted back to VW 2018 which had different issues.
Hans