Error - Unsupported File format

I get this when using the webmaster tools from Google. And then when I view the url I get a bunch of errors. I just reuploaded the 2.1 files and overwrote the plugin and still get this:

http://www.layeredgfx.com/forums/sitemap_index.xml.gz

Nevermind. I guess there was a downloads.dat file there causing the error. Once I removed that, it worked fine.

I'm glad to see that you were able to successfully resolve the issue.