As with any research tool of this magnitude and complexity, bugs are inevitable and some have undoubtedly survived the testing phase. Researchers are encouraged to bring them to our attention.
Although the model will catch many oversights of the kind typically made by novices, it is ultimately the responsibility of the researcher to insure that the combination of options being used is relevant to the problem being studied. It is also stressed that the researcher accepts full responsibility for verifying that their particular configuration is working correctly.
Anyone may use MOM freely on a "use as is" basis. The authors of MOM assume no responsibility (zero) for any problems, incorrect usage, or bugs.