Ulster Bank has said it has now resolved the problem that resulted in money disappearing from the accounts of some customers.
In a statement this morning, Ulster Bank again apologised and said it would ensure that no customer was left out of pocket.
"The corrective action taken overnight to resolve the issue has been successful and all transactions have now been posted to customers accounts," the statement said.
However, it is understood a number of customers are still experiencing problems this morning.
Senior executives from Ulster Bank are to be asked to appear before an Oireachtas committee to answer questions about the problem, which the bank said was due to "human error".
Hundreds of people yesterday claimed that their salaries had disappeared from their accounts.
Customers said their cards were declined when making purchases, while others said they had insufficient funds in their accounts to cover direct debits.
"As a result of human error, a payment file did not process last night, which means that some transactions applied to some customers accounts since 20 April are temporarily not showing," Ulster Bank said yesterday.
