F-Secure and Internet Explorer 11 incompatibility
Installed Windows 8.1 today and found out that F-Secure Online Safety add-on is not fully compatible with IE 11. Had a couple of technicians look at it over remote computer connection. IE flagged up that the F-Secure add-on was not compatible. Reinstallation of the browser add-ons through F-Secure settings did not work. After a long time, the technician disabled the 'Enhanced Protection Mode' in Internet Explorer advanced settings (without asking me) and this solved the problem - the add-on could be enabled as normal.
I was not happy about this solution - especially deactivating an inbuilt security feature in order to favour F-Secure. I was told that a fix will be coming around in January 2014 and that the issue was being escalated.
I have decided to reenable the Enhanced Protection Mode in IE 11. The add-on from F-Secure still seems to function but it is flagged as incompatible. It seems to work fine with Chrome and Opera.
I would have hoped, however, that such an obvious bug wouldbe fixed well before next year.
Anyway, posting this incase anyone else comes up against the same problem - might save a lot of time.