Oh man, you gave me the solution!!!!
I've checked it again acording to your screenshots.
And on screenshot 2 (SM51-> Active Trace Components) I did see, that you have another Screen and so that I always checked the wrong traces.
Because I always checked the General Settings but never for "Active Component".
And there I did see that someone did activate the trace Level for one process.
Now I've rested the Settings and I am sure everything is fine now.
BTW: the process which is having a high tracelevel will be highlighted yellow.
Thx so much to everyone for great and fast help!!!!