Well, to make matters more confusing, I've seen chameleons raised in the full sun of Florida develop MBD - severe MBD. In fact, the only MBD I've experienced was from babies I ordered from a breeder in florida. they were raised in sunlight.
I recieved them at one month of age and they were big enough to eat 3/4 inch crickets.
I was worried that they might be growing a bit fast, and it was summer, so I raised them with sunlight just about every day. Within a month, they were huge - easily able to eat adult crickets, and then some. At the 2 month mark, they went to jelly - full on MBD. Skulls soft, bowed legs, bumps on the ribs, deformed casque. One recovered fully, and I was able to straighten out her casque. Couldn't tell the difference.
The other was so bad after she "recovered" she was unable to eat. The bones that support her tongue were deformed. It was terrible.
I did some research, and found this was actually common. I spoke to Liddy Kammer, and they'd seen the exact thing. Some breeders will feed their baby veileds so much, they grow too fast for the bones to keep up. Liddy even saw some baby veileds raised outdoors 24/7 come down wiht MBD. They were given access to food round the clock.
In the above case, if the supplements are good (I dont' know that particular brand), I suspect what kinyonga brought up - sounds likely. A good way to check the CURRENT state of the chameleon's bone strength is to try - gently - to wiggle the casque back and forth. If it doesnt' budge, odds are it's fine. If it moves, and it's NOT a growing animal, chances are there's soem calcium issue.
You have to remember, properly caring for these things in such an artificial environment isn't a simple matter. Simply giving supplements and using UVB doesn't mean it'll be fine - you have to ensure it's Good UVB in proper levels, and the supplementation can't be any brand - in fact, I've read labels, and the majority of brands out there simply will not cut it.
They either have too much vitamin A, too low of a Calcium/phosphorus ratio, too little D3, etc. That's why I use 4 different supplements.
One calcium with D3, one calcium without, one multivitamin with preformed A, and one without(herptivite).