I don't know where to report a bug I found in IE7, so I'll drop it here for now... or... maybe someone can direct me where to report this officially ;)
First I set IE7's Home Page to a local HTML file on my hard drive. When for some reason the link to the Home Page is no longer valid (say: the HTML file was renamed) then the drop down menu next to the 'Home' icon in the Command Bar is not accessible anymore... The only remaining way to re-set your Home Page is via the General Tab on the Internet Options menu.
I suggest to check the validity of the 'Home Pages' in that drop down menu and grey them out and/or add an indication of the invalidity and make the drop down menu accessible again, even though an error in a Home Page exists...
with kind regards,
Internet Explorer Development7