I've been having this problem twice:
I've got some cgi scripts and files in my primary/html and /cgi-bin and somehow their CHMOD seem to have been changed.
I needed to reset everything manually.
I don't know what could have caused this. The only thing I can imagine is that I updated my SME 5.6 to the latest (update4) and after that did a signal-event post upgrade and a reboot.
Does anyone else have this problem? Or does anyone have any ideas what this can be?
Thanks,
Meert