I haven’t seen your post. Thank you, Mauri.
I’ve been fighting against my two computers and JBridge works in one of them. Unfortunately, is the one at home (Intel Core i7-4770S processor and 16 GB) but not at the studio. Anyway, I can render at home the MIDI files to audio and use the B4 again. 
Can’t find why it doesn’t work at the studio. I receive a message that the 64 bits file has not been created.