Can someone explain to me why is CIS showing blockings of safe apps for which I never received any notification?
I have split your post as it is off topic and is not the place to ask for help. As for your question, you need to look at the HIPS event log to know why HIPS is blocking these applications. The blocked application list is not going to give you any information why something is blocked other than what component blocked it.
Here it is. RTSS keeps reappearing after each restart.
You are seeing the self protection of CIS at work. Other programs are not allowed to access CIS processes in memory. It’s by design.