I think i followed an Ubuntu perfect install. Cant remember for sure what versions. A long time has passed since the install was made.
The thing is that about 2-3 month ago there was this web page that "landed" in our server and needed mod-rewrite. So I installed/configured it. And I believe that it worked at the beginning. Since then i haven't had a reason to use ISPConfig so I don't know since when the problem has existed.
Anyway.. I should try reinstall mod-rewrite, to see if it fixes it.. Any good walktroughs someone could recommend? So I would get everything 100% right.