I had no issues with Nvidia Surround using three monitors when it was pre SLI.

After I installed second card the center taskbar is "hovering" at the bottom, I see the wallpaper under the center taskbar. Sometimes the DF taskbars will do the same thing and hover one taskbar height above the bottom.

Then for the start menu when I click on it from the center monitor the menu will appear on my left screen at the top left corner.

See attached images...

Thank you for your time and help.

Yes, the nvsmartmaxapp processes was running. I followed your instructions and disabled NVDIA helper processes and after the restart the issue was resolved. Thank you!