Similar issue here.
On 12/30 I had 89,000 with 70,000 expiring 12/31. When I logged in on 12/31 to book I was down to 19,000 already, but was still able to book 3 nights for 75,000 points. I should now have 14,000 but my balance shows 0. Will call them monday to see what can be done.
rich