I had my gallbladder out 2 years ago - best thing I ever did!
My understanding is that the Atkins diet doesn't cause gallbladder problems but that if you already have gallstones, it probably isn't the right time to be doing it.
While I was waiting for the surgery, my surgeon suggested that I eat a low fat diet to reduce the number of attacks. His reasoning was that the gallbladder only stores extra bile - your liver produces what it thinks you need to break down the fat from each meal. If it produces too much it stores the extra in your gallbladder. If you then eat a high fat meal and your liver hasn't made enough bile for that meal, your gallbladder contracts and releases more bile. of course when your gallbladder contracts, the gallstones are pushed into the opening of the gallbladder and causes much pain.
So eat not too much fat to avoid the gallbladder contractions.

Cheers, Theresa