Preconditions not working in RTC

Maybe someone else did something? Things like this are usually configuration errors and they don't fix themselves.

I am the only one who is handling the administration of the whole environment. No idea what happened.

If you refer to and use process sharing, please be aware that you should only change the process in the project area that is sharing. Then you will see the change in the project areas that share the process. If you change the process in the sharing areas, you overwrite and potentially disconnect sharing for the area you overwrite.

If you refer to team areas nested in the project area, then the levels are completely disconnected. If you change the project areas process, this does not show up anywhere else. The mechanism how this works is explained here:

I am changing things only in parent project area (the one which is sharing). No changes are done in child project areas.