Regarding the amulet and crown – personally, everything is fine with me; perhaps, the changes in stats may not be immediately reflected in the game interface (this can especially occur in single-player mode). Simply exit and re-enter the hero interface.
Regarding the events in battle – what version of the game do you have (Steam/Buka, etc.)? It is possible that the new executable file is incompatible with your version. Try placing these executables in the bin folder of your Heroes game; they are guaranteed to be compatible: these.