K, It's fixed! I already had uninstalled and reinstalled, restarted a few times, with no luck. Then I remembered I had changed some graphic settings in my Nvidia control panel for MSFS after watching a best settings video on YT. Specifically, I had disabled astroscopic filter in game, but enabled it as on, 16x, in the Nvidia settings. The theory being Nvidia does a better job of it, direct through the driver. Well, I reset those back to their defaults, in the Nvidia control panel to application controlled. Went back into MSFS and turned astroscopic filtering back on there, restarted and...no more pink textures on the GPU carts!
I wonder if I stumbled onto a bug with Nvidia driver astroscopic filtering of some sort...no idea...But everything is back to normal now...