The multiload, per se, does not increase or effect weight in the body so you can rest on that account.
There are a number of times that the body weight reaches a plateau so you have to trick the body by doing something different so that you shake it out of its reverie! Change your schedule by going through a different cardio program. Also do include strength and flexibility training like yoga or weight training to add a boost. Do however, work under supervision till you have got it right.