Microsoft is currently prompting peeps to upgrade to IE11, which I have just done.
It appears there is a compatibility problem which arises when accessing certain websites, including the Daily Telegraph from IE11. There's reports that it has also affected an on-line banking website, although I don't know which bank .....
You get a recurring popup saying "Scanstyles does not work with Opera /Web / Firefox" or similar variation.
This is off the Microsoft forum:
http://answers.microsoft.com/en-us/ie/f ... 8970536cc1
There is a simple fix which you can do, which is mentioned in the later pages of the thread (basically adding the Telegraph's url to the Compatability View List).
Seems to work for me (so far, touch wood!)
Just saying in case anyone else has had it ......