After Effects Hangs (freezes) when using external video output
I am using After Effects 2021 (18.4.1) on a Mac Pro Mid-2012 with a XFX Radeon RX580 (8 GB) video card. After Effects crashes often upon import, changing compositions, or even opening AE when you use an external monitor for video preview. I have wrote in about this previously using my work email/login prior. After several attempts and trials, I have narrowed down why the beach-ball of death happens either when I open/import/change compositions, After Effects wants to hang-up or crash when you use video preview output. This was not a problem in 2020 version. I notice that when I use (/ = keypad key) to toggle off the video preview and leave it off or disable Mercury Transmit, After Effects does NOT hang or crash.
Is there a fix for this? Please look into it whenever possible.
Thanks in advance.
OS Mojave 10.14.6
XFX Radeon RX580 (8GB) Video Card
After Effects 18.4.1

