You get that if some of the transactions don't accurately match what is on the blockchain (for whatever reason).
If you do a 'Tools ! Reset blockchain and transactions' from the day before the first transaction it will go to a Bitcoin node and recreate everything.
Can't promise you'll end up with $35k though. :-)
i have same problem. I have 2 computers. yesterday I was transferred my 3.14 BTC from one to another. after that, I sent 50$ BTC to my friend.
But multibit showed something spendable BTC!
I've been trying to"Reset blockchain and transactions" since yesterday but nothing change!
I experienced the same problem before, i lost 1 BTC 1 months ago!
http://i41.tinypic.com/2r2vzu1.pnghttp://i39.tinypic.com/2zsa9gj.png