On a couple of occasions when I have being reconciling the bank account a transaction is not showing on the reconclie screen, but if I go into reports and list unreconciled payments/ receipts the transaction is showing there.
Could this be a date issue? I dont use Tas but I've had similar problems on Sage. I had set the current date incorrectly on Sage and when I ran the bank report I had to choose the date range. This gave two different results - very frustrating!