I just opened my multi bit wallet, and the 1.36275883 that was in there is now gone. It loaded a brand new wallet, so I don't even have my old wallet with the old transactions or password. I know what my old address was. I checked it on blockchain.info, and sure enough, there is the transaction that emptied it out.
So I can kind of make peace with losing over $300. I'm mad about it. But what I really need to know is, what happened and how do I prevent it from happening again. Can someone help with this issue?