Many thanks for letting us know JohnPic - it looks like mine is now fixed as well so I assume it is now fixed for everyone so that is good news!
Unfortunately the last post seems to be premature as I have been experiencing the same difficulty for many months. Despite countless hours spent in on-line chats and telephone calls with a multitude of BT personnel, where the advice offered has varied from having the wrong billing type (Online) to using the wrong type of web browser (Mozilla Firefox), the problem persists.
Hopefully there is still a kindly soul within this community who may proffer some salvation in allowing me to see my call history on MYBT.