mt5 relates to a single material file, for one material zone (skin, eyes, lips, whatever)... mc6 refers to a material collection - equivalent of a mat pose... now, because the mc6 was only implemented in Poser 6, it's not backwards compatible... but then, since anything before P5 only used the basic material room, that's no real loss, surely?

As for P5 users of your stuff... hmm, well perhaps one of lesbentley's fixes to mat files would work - shame about needing a figure in the image, though...

I'm guessing all this is for your superb looking SF crates?

JonTheCelt