Mirillis forum

For some reason Action! Wont record when i have d3d9.dll in the games dir that i want to record, Action! Will just crash the game, it wont even launch, Can you please fix this issue, or is there a way i can fix it without removing the d3d9.dll?

d3d9.dll is a system library which Action! only use. Try re-installing your DirectX.

He's most likely talking about injection methods that use that .dll specifically. Methods like ENB or SMAA/FXAA and that sort of stuff, make Action unhappy often especially SMAA.