I suffered a random crash where Zbrush managed to save my work. However now that file and all my other files are stuck changed. They’re all a charcoal grey and masking is invisible on them, however I can still edit the work. I just can’t change the color or mask the model.
Hey im a noob in zbrush, but im not sure whats your level of advancement in this program. So i will risk giving a newb tip: Before your objects get filled with material and color (color -> fill object [with M/RGB enabled]) they will inherit whatever are your current selected material and color.
Might be also problem that that crush somehow filled them with charcoal grey. Try changing the material of your brush and then do color -> fill object with new one. Or just deselect the brush icon at the subtool window with any other material selected on your brush and see if that changes them.
Sorry if thats not the issue here and if you have tryied it already.