This one's weird, and I don't know how to troubleshoot it. I have a pretty basic Perl script that grabs a random line, and that's being sourced from a page with <!--#exec cgi="blah blah"... From the command line, it works every time. When I view it in a browser though, it only works 60-70% of the time. Otherwise, there's nothing included, and it appears from a couple of tests that it's not even calling the Perl script.
Any ideas on how to track this down? I can provide more information if needed, but I don't understand why it's only working sporadically.