I had the same issue:
The multi-view does not output, the program view works.
I sent the atem to england (52€), BMD Support tested it with different monitors and told me it was working. Indeed, with another large samsung monitor, it is working.
I ordered an small monitor (XOMAX 15,6″) and it is not working.
BMD told me they are going to give me the list of the monitors used succesfully during the test.