Innocent customers have been left unable to send or receive money due to new transfer rules designed to block fraudulent transactions.
Mirror Money has heard from customers who have had their incoming payments flagged, simply because their names are 'too long'.
In other cases, customers say they've received warning signs when transferring money, despite the recipient's details being correct.
In one instance, a small business owner was unable to receive a payment because his name contained a hyphen the bank didn't recgnise.
Read more on mirror.co.uk