I know this post will garner me very little sympathy... but here-a-goes!
I was stuck on 39,999 nerd points for a couple of weeks! My wife was pretty amazed I somehow froze it right there. The last achievement I got I had assumed would push me over 40k, so imagine my chagrin to see it sitting pretty at 39,999. :(
But I snagged a few easy ones on Yourshape Fitness today, so it's all right now. :)