NIS 2010 Autofill logins

Hi, I am new to the forum. I have been using NIS since 2004, like and trust the product. I put my family and friends onto it.

There have been bugs along the way but it is continually improving.

I have a question about the autofill function:

What determines whether autofill will or will not work on a web site?

I know most of my banking logins do not ask for autofill data to be remembered, in fact I prefer it that way and tell Norton not to remember this site.

I now have five or six of my favourite sites, all with saved logins, not being autofilled.

Is it Norton or is it the website that allows the interaction or lack of interaction?

Is there a workaround to get these logins working?