I never encrypted my wallet. When I installed it I never encrypted it. I then funded the address and I now have 1.1 bitcoins. But when I tried to send or create a new address it asked for a passphrase. I tried every possible password I have ever used. It's very confusing because I added an extra address so I would of had to enter a passphrase 4 times to set one and create a new one. Have you ever heard of this? Can you or do you know anyone who could help
you should try asking this question at bitcointalk.org. If there is a bug in the client then perhaps it will help if you try copying your wallet.dat somewhere and loading it into a new version of client or fresh install? It is a good idea to have your private key for each address you plan to store bitcoins in written down somewhere before you send bitcoins to them. You can then load that private key into any wallet in order to spend the bitcoins.