don't know what builb is but that sounds like a file system corruption. which may also explain the lost tracker index files. When did your problems start? Did you by any chance pull the battery out or long-pressed the power button recently?

Do other applications run? Can you see all your contacts? Saved games status, if you have any? What is shown on the PC when you attach your phone in mass storage mode? What does the following produce?

(Run as user, not root.)