I am on both. Didnt notice any problems with calcium channel block but have noticed I seem to gain weight easier on beta blocker.
I take both and I can't say either is a problem for me weight gaining-wise. My weight can go up/down 30 pounds, but it is always associated with caloric intake/burn imbalance. That is if I eat a lot of sweets (lover donuts, cake, pie, chocolate...) the weight goes up. If I stop and do a couple mile walk each day, my weight goes down, down to where it should be.
Let me add, Beta Blockers do cause some fatigue for me, and that makes it harder to exercise....so in that sense BB can be part of my weight gaining. But I can't blame the "sweet tooth" on the BB or CCB.