Today was a day of exploration. I decided that the most reasonable way to approach resolving the game freeze issue I am having is to see what others have done to avoid it. I looked through some of the posts at the CodePlex forums for farseer and have a couple of ideas, but there is nothing definitive. So, I registered and wrote a post asking for assistance. Hopefully, someone who has already solved this problem will be able to guess at what is going on.