I forgot to change horizontal resolution in Surround from bezel corrected setting of 5940 to 5760. I use the bezel corrected setting for Flight Sim and other games. Also, changed from r_synch "1" to r_synch "2" in the config file, replaced the multimon_config with the download file for triple mons, ...

Will try your suggestions, thanks for the quick response. I will definitely go mod free to start with. Been fishing all morning, now its time to relax and ATS working again.

Update 1.38 has totally hosed my triple monitor setup. Followed all the setup steps given in the first post directions for NPI settings, config file changes, multimon_config for triples, and AA worked well with V1.36 and V1.37. Now I get slanted pieces of the center monitor in both side monitors. Us...

@BenganJ, Road Runner and JHTrucker. You guys knocked it out of the park with this AA fix for me. I've used triple monitors for years on flight sim and the ability to get rid of shimmers and to see nice power lines using AA on triples has brought ATS to a graphics level I enjoy as much as flight sim...