Help with RSS feeds

[bbayliss]

Can someone please help me with my RSS feeds. They worked for me for a couple hours using Plunk some of my members have said that they have never been able to get them to work. It does not pass the RSS validator. Here sre the links.
Thank you,
Brian

http://www.methodzofmadness.com/php/smf/index.php?type=rss;action=.xml [nofollow]

http://www.feedvalidator.org/check?url=http://www.methodzofmadness.com/php/smf/index.php?type=rss;action=.xml [nofollow]

Here is the error one of my members got:

Error parsing RSS XML: Not a valid xml document: '', hexadecimal value 0x1F, is an invalid character. Line 1, position 1.

[Oldiesmann]

Thunderbird doesn't think it's a valid feed either...

[Oldiesmann]

Ok. I think I know what the deal is. For some reason, when you try to access that URL from your browser, it tries to download index.php with all kinds of garbled junk in it, and that's what the validator is seeing. I have no clue what's causing that, but it should still work (it works in Firefox anyway - add it as a new live bookmark)