No worries, does sound like you have one of the newer firmware versions which has the feature called MPS. You can either forward the additional ports 40000 - 40032 to the system or you can disable the feature completely in MMC861(I would disable this personally).

Do you have MGI licenses? also check in MMC615 that you have your MGI groups setup. These should contain all the MGI channels found in MMC724.

Give this a try and let me know.