LIfting weights & slow weight loss

It's hard to say because you didn't provide enough information:
1. how much weight were you losing per week to begin with?
2. how were you losing this weight? (cardio, diet, ...)
3. how long and how often are you lifting?
4. what muscle groups are you working?

As stated it will take a while for weight loss to show again. That is for various reasons in terms of changes in your muscles. When it comes down to weight training is far superior to steady state aerobics for weight loss. I was just reading of a study from the Physical Activity Sciences Lab in Quebec, Canada. Dr. Tremblay et al compared moderate intensity aerobic exercise to high intensity interval training for their effect on fat loss. The results based on caliper body fat measurements was that the interval group, while working out less time, lost more body fat. Their numbers conclude that the high intensity interval training was 9 times more efficient at burning fat. Other studies have shown the same thing, and some have even shown that aerobic exercise will make you more fat even though you may be lighter. Stick with the weights and other resistance exercises, and look for ways to increase the intensity of your workouts, it will burn more fat. Also, switch from using only the scale to measure success and instead get a measuring tape and measure yourself as well. You will start losing weight again, but there is a transition time. Just so you know I am transitioning out of long duration aerobic exercise which I used to do with weights, to something leaning more toward all weight workouts either with weights or using body weight exercises. I expect that my weight loss will slow a great deal because of it at first, but my fat lose will go up.