Is Lipotrim a VLCD? If it is, that could be your problem. I once did Lighter Life and whilst the weight absolutely dropped off whilst doing it, the moment I stopped I absolutely piled on weight because LL was only 500calories a day...and as soon as I ate more 'normally' (though healthily) the body simply started stockpiling because, essentially, I'd been starving it.
It takes awhile for the body to adjust after these meal replacement diets. I think if you stick to Cruise for a few weeks and discipline yourself to ONLY weigh once a week, you'll see a change.