Salvador,
MBM5 has some pretty detailed/lengthy instructions that need to be followed before it operates correctly. Hell, I have to reference the instructions if its a few months between installations. If you hit the "help" icon in the MBM folder, it should say "using MBM5 for the first time". If you click on that it walks you through step-by-step. Takes a few minutes the first time you set it up, but its well worth it!
Chiz