Re: ‘incompatible add-on’ , I ran the browser with add-ons disabled. It had no effect. Berny - you have been very patient and very helpful so far in guiding me. But I think I have stumbled on the solution of the problem by trying to ‘switch off’ the various security features of KSC. When I turn OFF the ‘Web Antivirus’ of KSC, the problem of login goes away. (Settings > Protection > Web Antivirus (turned off).) The function of ‘Web Antivirus’ is: “Scans incoming web traffic and prevents dangerous scripts”. Well, the secure login procedure to Jyske bank involves my bank sending me a message to my mobile phone to confirm *that it is me who tried to log on*. This apparently is interpreted (Wrongly) by KSC as ‘a dangerous script’? I have now switched off ‘Web Antivirus’ and all is well. I don’t care if my overall protection is weaker than before. I value my banking more than I value Kaspersky’s attempt to be ‘helpful’. Thanks again for your guidance.