QUESTION: I've noticed that sometimes I appear to be logged in twice on my Mac computer, and that seems to be interfering with Java apps. How do I stop this from happening?
Under the Apple menu I see two of many items:
- Restart
- Restart
- Shut Down
- Shut Down
- Log Out
- Log Out
ANSWER: You have VoiceOver turned on. Press <APPLE/COMAND>-F5 to turn it off.
Source - Logged in twice? - MacRumors Forums
 | Mac Secrets Mark Hattersley |