Refresh Error

From the Silverstripe forums:

Re: Can't Install Silverstripe on Godaddy Linux Hosting

If you have the "INTERNAL SERVER ERROR" problem when you refresh and you're using firefox with SilverStripe at godaddy
comment the line:
//header("Last-Modified: " . self::gmt_date(self::$modification_date));
in sapphire/core/HTTP.php

When this line is enabled the next request from firefox will be with If-Modified-Since header.
This seems to mess up godaddy... don't know why yet.

The fix smells like a bit of a fudge but what the hell..