I had the same problem with my boat, which had been on land for over a year when I got her. Not only were the floorboards swollen, but because the had been under water for so long they were soft as well. Additionally, the table posts had been left in and would not budge. I had to pry the floorboards up using a long (12") flat head screwdriver, then work them up over the table posts. Unfortunately they came apart partially during this process, and I will probably need to replace them. I still need to cut the frozen table posts out of their holes.
