You can check out my blog for more details and some pictures but I was having the same problem and I waited a little too long before doing anything about it, this cuased me to have some collapsed comb early on but things are much better now, I found that I could do things two ways, 1. if the comb is just slightly off, push it back in line with your thumb, I did this and started checking the hive every 3-4 days for a while, each time I made a correction in the hive it was less than the previous visit. 2. Take a sharp knife (I used my fish filleting knife) where the comb is going off center, start at bottom and cut up, as you get near the top curve the cut so you dont go right upto the bar and then cut along the bar to remove the errant comb, then as the bees build it back up use your thumb to keep them in line, figure it took 3 weeks total to get all bars back on course. I did have some comb failure but it was not as bad as I expected.