Found the problem!
I have an M-code to remove the menu from screen, so I entered it to the macropump.m1s as a line:
code "M1000"
It turned out this was the problem.
Solved it removing the Code"M1000" and entering the line DoOEMButton(348), which is the only line in M1000.m1s
Hood, do you know why this happens?
Luis