BTYahoo webmail issue- content cannot be dispayed in a frame

When I click on the 'contacts' tab using webmail I get the following error: 'This content cannot be displayed in a frame'. I have tried on 2 different computers, one has Win7 (IE11) other has XP (IE8), and it's the same on both computers so this would point to a problem with BTYahoo rather than the computer. Anyone any idea why I'm getting this error?

i've had this problems with lots of different sites recently, including not being able to pay bills on line. I tried on several different computers (different os and different browsers) all with the same results. It eventually went awayand I've never got to the bottom of the reason why I got teh message.

TLMC