Have you tried clearing the pin from phone by going to Settings / Applications / Manage Applications / All / Sync Services and clear data and cache... After coing this you should be prompted yo reenter info when BA app is opened again.
By the way you do realize you do not need BA when Google backs up the sane info, just thought I would throw that out there..
Also have you tried logging into the BA site (It uses site logon not BA to access this info) at https://wbillpay.verizonwireless.com/ba/secure/backupassistant.action# and click show PIN to verify number?
View PINYou will be prompted for your PIN when setting up a
replacement phone or changing your current PIN. You
should have your device on hand during the process.1. Replacement phone - Enter the Backup AssistantPIN when prompted on your handset.2. Changing your PIN - Access Backup Assistant onyour handset:
- select Options
- select Change PIN
- enter the PIN shown on the right in the enter
old PIN field
- click Next then enter your new PIN
- click next
- click OK to complete the PIN change.