worked with support chat for a few hours today. only resolution was a workaround. deleting the adjustments already made. pay sales tax window,  sett date to earliest day before collectingsales tax. this gives the negative value needing to be adjusted for, adjust increase this value, account - ask my accountant. then go back and try to pay the sales tax.   this was now positive.  im still convinced there is a bug inside relating to modifying the "opening balance equity" account and entering old transactions.