I have the same problem. Firefox is tossing me a bunch of source code, while in Opera and IE7 the page shows properly.

I see everyone talking about enabling XLS and XML support, but as far as I can see it is enabled.

xml
XML Support active
XML Namespace Support active
libxml2 Version 2.6.30

xsl
XSL enabled
libxslt Version 1.1.21
libxslt compiled against libxml Version 2.6.30
EXSLT enabled
libexslt Version 1.1.21

I'm a bit at a loss here. Has anyone been able to actually see more solve this problem?