I recently built a PC and ran a trial of Avid 8.6.1 and everything ran perfectly. Once the trial ended, I bought the student subscription which came with an update to 8.6.3. I also downloaded Resolve Lite 12.5. Everything ran smoothly.
That night I shutdown, and Windows did an update for stability improvements for the Windows 10 Version 1607 servicing stack. The next day I open Avid and it crashed. It crashes just on 'Initializng ACPL Effects - GPU Support Enabled'. I've tried various things, but Avid continues to crash.
I went back to version 8.6.1
I made sure my GPU driver was up to date
I removed plugins from your AVX2 folder - nothing changed. I placed them back
Everything else is running just fine on my computer such as Resolve, but I did uninstall it just to troubleshoot, but Avid continues to crash.
I have the same issue, except that on my workstation it never even worked in the first place. After installing the 8.6.1 trial, it got stuck at Initializing ACPL Effects, after updating the GPU driver (ATI RADEON HD7950) it now gets stuck at Initializing Composer Window. Davinci Resolve 12.5 is also installed on my system, for the rest it's a clean machine. To this point, I still have no solution for the problem.