There is something wrong with payments when applying it to invoices. It seems to "Split" the amounts between multiple existing unpaid invoices when you select a invoice which is not the latest invoice, you have to then manually remove the amounts from the applied fields and hit enter otherwise everything gets messed up and invoices get amounts applied to which should not get. Tech dept please review your software and provide a fix, or if somebody else has a fix please provide a download link. Thanks.