Title
The author of CE:Fast Track put out a statement:
sumghai [author] 14 hours ago
@all - A fix (for the purple square texture issue was brought in from the upstream CE mod, and will be included in the next FastTrack release sometime this weekend.

The fix (technically a workaround) disables all copies of the GraphicApparelDetour.DLL included in many third-party apparel mods, as that assembly uses an outdated patching method incompatible with CE 1.6/1.7/1.8+'s new apparel layers and rendering systems. Please (nicely!) ask the author of the DLL to update it to support CE's new layers.

I get these issue with your Furniture and faction mods, all of which contain that DLL. I dont know what one specifically though.

Problem is there with these mods enabled, and isnt with them disabled. they're also the only mods in my folder with that dll in them