Multiplayer CTD Server/Object issue?

[SEE]

Slip ball, I have tried more variables to cure my rapid LE crashes on ATAG than I care to count. I never tried SSAO simply because of the performance hit it might cause.

In my opening post I also mentioned that this problem on my rig was server dependent - no problems with my settings when Low, Med or high in SP or some other servers - only ATAG and Kampverband13 No2 caused rapid CTD.

If I disable shadows and enable SSAO I get LE crash within 10 minutes.

Enabling both has little impact on my FPS but as to why enabling both works is very contentious and it doesn't make sense to me either -especially since I only have to enable these for two particular servers.