By Gareth FinighanSome bank customers attempting to carry out financial transactions online have been left frustrated by a computer glitch blocking them from logging onto the system.The Butterfield Bank malfunction has caused “intermittent problems” for some users since the start of the week.A bank spokesman said: “We have about 100 users logged on and using the system right now so it is up and running but some customers may be having intermittent problems trying to log on.“Our IT department is aware of it and we are working on it. In the meantime, I would advise anyone who is having any problems to wait and try again a few minutes later.”