TY,
The site seems to have been hacked. I had found several suspicious "<script></script>" entries, unexpected images, and experienced apache2 crashes.
I deleted the whole source code, upgraded as many packages as possible, and installed a totally new php engine. The site seems to be clean and stable. Some of the members of my community (including me) use Avast that blocks the url as long as it is blacklisted.
I have requested a review at stopbadware.org, and indicated goodware at trendmicro.
Do I have to restore my reputation at each reputation site not to be blacklisted, or it is possible that Avast checks the site and make me whitelisted?