could be..quick check, right click on the icon for a mat, and try 'save target as'..see if you get a link to fortunecity..alas, sometimes the web sites disappear (a lot more of a problem on Poser, but then not everyone can afford to pay for a website..present company included..;) Also, try emailing or IM'ing Sefi..he had about 60 mats, or at least that's about how many I downloaded..short answer, is when you see a web site offering something, download first, ask questions later..;)
If you're looking for mats, try,
www.lunariad.com
Pixel Wonder
Wolfie's Den
and a general search on 'Bryce Materials' in Google will bring up a list of the usual suspects..I've got over a thousand mats downloaded (but have only used about a couple hundred..;) have fun.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)