Hi , in fact I did copied/duplicated the blueprints more than once (on of the first approaches I took). I also tried to restart all the programming from scratch, but the problem eventually poped in after a while and in randomic form.
I noticed that after renaming and recompiling everything seem to work for some time but, again, just for a little while. Based on the behaviour and the random nature of these occurences I can only assume that this is an engine bug, though no one from Epic staff has given me any answer yet. Any thoughts?