Roboform will not auto fill from some log ins

I have had both Roboform and Norton 360 for some years now and there has never been a problem. In the last 12 months some of my Logins will not auto fill anymore but many others will. I have been in touch with Roboform and after trying various solutions we have come to the conclusion that Norton 360 prevents the auto fill on some Logins but not the others. When I disable Norton 360 Roboform works on autofill for the problem ones. Obviously I want security on the internet so am not prepared to turn Norton on and off. Is there a solution to this?