I couldn't name the thread after an addon causing the problem because I have no idea which one is :/
Anyway, last night I used WAU to update my addons and in the middle of the updates it crashed and after that I can't use the "steel" textures on my bars anymore. Anyone have an idea what could be causing this?
in wau, check teh box for SharedMedia (and SharedMediaLib if you have it installed) and then use file >uninstall marked. then scroll down, check sharedmedia (it will be in the not-installed section) and install it!