Ulster Bank has apologised to customers after its latest computer glitch saw some accounts debited twice for ATM withdrawals.
The issue first struck on Easter Monday and affected customers withdrawing money in Northern Ireland for around 24 hours.
The bank is now using Twitter to apologise to irate customers and says that it is working to identified those who have been affected, insisting that no one will be left out of pocket.
Ulster Bank has suffered several IT meltdowns over the last couple of years. In December online services at the Royal Bank of Scotland subsidiary were disrupted, hitting overnight payments processing.
A more serious outage in 2012 saw customers locked out of their accounts for several days, costing RBS more than £120 million in compensation and CEO Stephen Hester his bonus.