While in the setup room, I'm going to guess you had to play with object grouping?  I think it's possible to accidentally delete your material group assignments while using group editor.

On the other hand, playing with a setup room and joint parameters and all that has driven me into teporary insanity modes where for some time afterwards I'm worn out and miss the simplest things. ;)

Hi, my namez: "NO, Bad Kitteh, NO!"  Whaz yurs?
BadKittehCo Store  BadKittehCo Freebies and product support