I shared a list with two contacts and it was working fine until this afternoon, when I was suddenly locked out of the list. It appears on my lists still, but when I click on it, it says "You have no incomplete tasks in this list. Woohoo!" My view of the list is empty, and the completed items are no longer there to access. The problem is, the list is still populated, and my two contacts can see all the items fine. They are unable to re-share the list with me. I can't seem to accept a list that I already have access to -- theoretically, at least.