Reuters' electronic currency matching system was hit by a systems outage on Sunday that prompted some dealers to switch to alternative venues or trade over the phone, according to the company's own news service.
The vendor shut down the servers for its Dealing 3000 Matching platform at 22:05 GMT on Sunday to carry out emergency maintenance work. This is around the time that global trade kicks off in Wellington and Sydney.
According to Reuters reports some dealers switched to alternative venues like the Icap-owned EBS platform, while other traders resorted to voice brokers.
The outage hit dealings in the British pound and Australian, Canadian and New Zealand dollars. Activity in euro/dollar and yen/dollar trading was not affected.
A full service was restored by 05:30 GMT on Monday - in time for European trading.