Hi Mark,
you wrote...
> Permission denied at /Library/WebServer/CGI-Executables/write.cgi
>
> All the permissions for each of these directories are 755. Something is
> a miss. So what can I do?! I'm very confused.
There's your problem. 755 will not allow the "www" user (or whatever
you've set apache to run as) to write into that directory. The
permission for "all" is read and execute, *not* write. Hence "permission
denied".
Try getting it to write to some junk directory on which you've set
permissions to be 777 (say). Success will come!
Cheers,
Paul
