I can confirm this, CS:GO crashes everytime I try to record. It happened with earlier versions also, I can't actually recall when it worked the last time.
Any help would be greatly appreciated.
Action! 4.10.5 Full
Happens with: Action! 4.11 Full also
OS: Windows 10 - 2004
Mirillis Action!: 4.11 Full verion
CPU: AMD Ryzen 3600X
Video Card: Nvidia GeForce® GTX 1070 WINDFORCE OC 8G
Memory: 32 GB
Monitor Resolution: 1920x1080
Video Editor: Blender
Video Type: MP4