There seems to be a major issue while using AO (Ambient Occlusion) with FFXI online, anything over version 4.5.3.
from 4.5.4 to 4.9.1, there seems to be some flickering issue while using AO, no matter which one: HBAO/MXAO/SSDO,etc.
I also tried version 5.0.2 and above, those are alot worse, infact, they don't work at all, even if it did, it would only for for a split second or two then it will just disappear on its own.
This was on both DX9 (With the use of the injection tool called: FFXI_d3dto9_proxy_v220.127.116.11 by Atom0ic), as well as DX11 (DG Voodoo 2).
Also, just another heads up, MSAA+SGSSAA within nvidia inspector works excellent under DX11 with DG Voodoo 2 (If using reshade version 4.5.3), but, soon as I want to use any form of AO within reshade, nothing appears, all the other reshade, such as bloom, HDR and whatnot, are working fine in conjuction with MSAA+SGSSAA.
Forgot to say this earlier:
While using Ambient Occlusion under DX11 (DG Voodoo 2), there is a very abnormal/massive performance drop, no matter the AO shaders, but in DX 9's case, there is none that I can see, just the normal performance drop from the AO shaders themselves.