Error Code 267 - Rebuild not working

Earlier today I opened an old customer invoice from 2010 to view it.   When I closed it, asked for the password to make a change before the close date.   I didn't want to make any changes and  I haven't used that in so long I didn't even know the password.  I clicked cancel and closed it.  

Later in the day after doing a LOT of work in quickbooks, I opened the balance sheet.  An error popped up I've never seen stating the balance sheet was not in balance and a rebuild needed to be done.  I ran the rebuild.  It said some errors could not be fixed -- "Realm Input: Token Headers for the user found to be NULL"   Then it said others could be fixed & those were in areas of account balance, name balance & transaction.  I ran the rebuild again and the next time I got Error 267 specific to the very invoice that I had opened earlier in the day.   It also stated"  Target is missing a sales tax code when it should have one"   We are a non-profit who operates in Oregon.  We've never used sales taxes.   Then  I opened the invoice and it now shows as not paid.  It has several extra lines of positive & then negative entries to uncategorized transactions.  Though the customer shows as a zero balance (which is correct), it lists this invoice as unpaid.  I ran an audit trail and it shows the invoice as changed today -- it is the same net amount as before but with the several counterbalancing lines.   All the customer's payments are accounted for and show as being applied - but the invoice shows as unpaid.   I have tried everything I can think of and can't figure out how to fix this!   I have tried running the rebuild so many times & it just isn't working.  Any help appreciated!