Payments I received one and two years ago were now marked to pay for random invoices in the future (i.e. When I received multiple invoices and applied credits, if I went back to look at them afterwards, they were changed - different invoices were checked, different credits applied, partial payments were created.
But even worse, this software is full of bugs.
To start with, this software is way backward from even the 1999 version of PC Quickbooks without many features - particularly, the inability to select which credits I want to apply to an invoice or to unapply credits to an invoice to name just one.