However.
I figured that the pathfinding systemfrom the goodies folder has some problems.
My monster constantly gets stuck and often can`t follow me up higher egs...
I doubt it! I use it all the time for 2D and 3D projects and it works fine for me (even for hundreds of Zombies). Just try and remove or add USE_BOX to the tracemode, this alone may fix some of your problems.