RAM Preview Unresponsive in Mac OS Big Sur

Recently updated to Mac OS Big Sur on 2013 (Trashcan Style) Mac Pro, running AE 17.6.0 (most current build).

Ever since the update, I have had frequent issues with working in AE, most notably after working for a few minutes, the RAM preview will suddenly stop working. It will render a few seconds and then stop and not play anymore, no matter what I push or where I put the playhead. AE is still responsive at this point, I can still save my compisition, open and close windows and such, but I can't play my video. However, once I try to quit the application, then it hangs, beachballs, and I have to force quit. I'm at my wit's end with it and I can't get many important projects finished.

One thing I have noticed in the console is that all the Adobe apps have been throwing errors about not being able to find the OpenGL drivers, but it appears that Apple got rid of OpenGL in Big Sur, so I'm not sure what can be done about that? 

The following services keep throwing the exact same three errors: Adobe CEF Helper (GPU)[4110], VTEncoderXPCService[4129], Adobe Desktop Service[4132], AIGPUSniffer[4604], Adobe InDesign 2021[4591], CEPHtmlEngine Helper[4622], Adobe Photoshop 2021[4702], Adobe Spaces Helper[4712], AEGPUSniffer[4746], After Effects[4742], GPUSniffer[4750], CVMCompiler[4758], Adobe Media Encoder 2020[4863], and aerendercore[4869]

The 3 errors are:
getattrlist failed for /Library/GPUBundles/AMDRadeonX4000GLDriver.bundle/Contents/MacOS/ATIRadeonX4000SCLib.dylib: #2: No such file or directory

getattrlist failed for /System/Library/Extensions/AMDRadeonX4000GLDriver.bundle/Contents/MacOS/ATIRadeonX4000SCLib.dylib: #2: No such file or directory

getattrlist failed for /System/Library/Frameworks/OpenGL.framework/Resources//GLRendererFloat.bundle/GLRendererFloat: #2: No such file or directory

Navigating to these folders via finder shows they are indeed empty of these particular files- even with hidden files and folders turned on. I went to AMD's website and didn't see anything I could download for my GPU.

The crash logs for AE report an EXC_Crash (Sigterm), I'll attach the log below just in case it might be of help. If anyone has any reccomendations, here's what I've tried so far to no avail:

- Resetting preferences file
- Reinstalling After Effects 2020

- Turning on/off Software only vs Mercury rendering in project settings

- Installing After Effects 2019 - I just get repeated unspecified drawing errors when I try to open it. 

Computer Specs:
2013 Mac Pro Running Big Sur 11.1
3.7 GHz Quad-Core Intel Xeon E5

64 GB 1066 MGz DDR3
Dual AMD FirePro D300 2GB