If as you say it's a depth-buffer issue, why would the HBAO I used previously work fine in that case? When I go back to the old Reshade, the HBAO still works fine.

If that's the case however, that's nothing a shader edit can fix. If it switches to maximum blur or no blur at all at the same rate as the MXAO flickering, then you have your problem. To test that, enable a strong DOF for testing purposes (not the fastDOF). Marty McFly wrote: Hmm See you sure that it is not a depth buffer issue? The algorithm of MXAO does the same every frame so when it looks fine in one moment and not in another, input must be the issue.