I can't test it out right now, but it might be a cookie thing - I don't like the way they changed this new version of Flock...
I'm going to see if I can download the older version - it was nearly the same as FF.
But your Verizon email is on a website- so no matter how you get to it it should act the same - but then again some websites don't "play" well with anything other than IE. So maybe Flock just has issues with that part of the email address area.
There's also Opera that is a free browser - but it has too many settings..I tried it for awhile - but just too many things to fiddle with - or I just fiddled with it too much LOL