I've been putting up a small site using password protect to hide a link, and I'm having issues getting it to work in IE or on my iPhone.
The site is: http://fennec1337.com
The password is: discovery
This is a WPMU site on my primary account http://hyper-wp.com
I just put this up and it could be that there's an issue at my office (although iPhone doesn't work over 3G even though it loads the page - when I type in the password and click Go, it takes a moment, reloads the page, and stil has the password field listed).
Now that I think about it, I do have QuickCache installed - however, as I mentioned earlier, I'm able to login just fine in Chrome.
I am heading home to check from a different location, but wanted to submit this question to see if I need to try something else (I've been setting this up for an event tonight and tomorrow).