This is a weird one, and unfortunately I can't test it. At my company we are on Vista now and are not slated to get our Win 7 machines for another few weeks, but a client is complaining about it now.
Basically, we have a form with username/password inputs and a submit button. Normal procedure is to enter your data and hit ENTER, bingo, off and running. This works everywhere and under all conditions EXCEPT in IE8 on Windows 7 when the https secure protocol is used.
I've read through the "Related Questions" offered when I created the title for this question (it's not the multiple forms issue, not the display:none issue, etc., because our page doesn't do any of that), and I've searched the Web, but as I have no Win 7 box right now and am under deadline pressure here, I beg your indulgence and turn to all you for any light you may shed on this issue at all.
Are there any security settings in IE8 or Win 7 that would prevent forms from submitting through ENTER key in IE8 on Win 7 using https? Anyone have any ideas at all? Please don't be afraid to speculate, I will not mark you down. This is kind of an emergency and I'm looking for any insights you may have. Thanks in advance.