I've just installed fileman on my account and everything seems to be just great!
But then I realise that the other perlscrips on the account are getting 500-errors.
I've just followed the fileman FAQ for F2S users on http://www.users.f2s.com/faq/fileman.php3
Can't figure out what is wrong.
Please help!

Hi - you need to set permissions on all directories on F2S to 755. I know, it's weird, because that's read-only, but that's how it goes on F2S. If the permissions on the directory you're trying to execute the script from are set to 777, you'll receive a 500 error (that's what I found when I used to use F2S).

Adrian