Material Not Compiling

Hey all,

So i’ve got a sofa set up with 3 materials, that can toggle between them all, however only 1 of the 3 actually compiles correctly, the other 2 appear in the grey checker pattern.

I’ve also set up another chair that toggles its visibility to cycle through a number of posistions in the room, this entire chair appears in the grey checker pattern.

I’ve tried re-compiling them etc. but no luck. Has anyone else experienced this/know how to solve it?