That is some coincidence... I had EXACTLY THE SAME HAPPEN 15TH OCTOBER...
I am now sitting and installing fedora core 6 and installing Pleask.. sorry but I need to feel safer..
I set up a catchall email on one of the webs, after the catchall was set NONE of my passwords worked.. could not ssh into it.. would not accept root user single mode... nothing nada... 120 km drive, get the box .. install FC6 ..
Too much of a coincidence? Could there be a problem with ispconfig security here?