I never did anything out of the ordinaryt, like manually making modifications tot the database. For the few things I did thusfar, I used ISPConfig. So it's quite strange to begin with that anything gor broken in the database. So what are my options?
Nothing that I'am aware of at the moment. The only solution I see is to try to compare the contents of the isp_nodes and isp_dep table in your installation with the contents of a blank installation and check if one of the root nodes has wrong permissions entrys.