Nationwide has pledged to rectify a technical glitch that means brokers using the latest Microsoft web browser are unable to access its new trading platform.
It admits that its platform, shared by subsidiary UCB, is not available to brokers using Internet Explorer 7.
Nationwide launched the platform last month to speed up broker transactions after heralding the launch over the past year.
A Microsoft spokeswoman confirms that any broker who has automated security updates from the software giant will be on Explorer 7, meaning that thousands of brokers are likely to be affected.
Nationwide spokeswoman Tamsin Hemsley says: “The problem is being rectified and we are working on it. Brokers experiencing problems should contact us as we can help them install alternative programs.”
Chase de Vere Mortgage Management director Nick Gardner says: “It is fundamental to be compliant with Explorer 7 as it is the main internet browser that people use. It is an astonishing technological error on its part. Whoever is responsible will be given a swift talking to as it is an embarrassing mistake and you would not have expected it from a lender of this size.”