I've been getting a pop-up message while browsing in Safari that a keychain can't be stored or something and the text of some of the sites - my bank's in particular - is running together so I called Apple and was told that some websites just aren't compatible with Safari.
And that surprised me given the size of my bank, and the impact that Apple has. So I was advised to download Firefox. So I did. And now we wait to see if any other issues persist.
Despite the issues, I'm still loving my new MBP.