During the disruption in 2012 caused by a faulty batch processing scheduler customers could not:
- Use online banking facilities to access their accounts
- Obtain accurate account balances from ATMs
- Make timely mortgage payments
- Access cash in foreign countries
In addition, the banks applied incorrect credit and debit interest to customers' accounts, and produced inaccurate bank statements.
In the summer of 2012 customers of RBS, NatWest and Ulster Bank were locked out of their accounts for days as a result of a glitch in the CA-7 batch process scheduler, freezing 12 million accounts. Customers could not access funds for a week or more as RBS, NatWest and the Ulster Bank manually updated account balances.