More info on last post...Here is where I saw that...
http://www.calendarscript.com/documentation/before_you_begin.html says there are conflicts with Perl and Frontpage:
"Transfer files to the web server
All the files and directories now on your local computer need to be transferred to your web server. The usual method to do this is via FTP. Using FrontPage is not recommended, as it has been known to cause problems with perl CGI scripts. "
But I can't tell if the problem is just using FTP to transfer files, or with the whole program (the warning hasn't appeared anywhere else, yet)