Passworded pages work with FireFox but not IE

I have an issue with password-protect pages on this little wedding web site I set up. Users using any version of FireFox have no problem entering the password and getting into the page just fine, but those using IE are out of luck.

The test page I set up is:
http://www.shannonandrick.com/wordpresstest/

The password for this test page is “wordpresstestpage”

Any help as to the resolution of this issue would be greatly appreciated!

Thanks in advance!

Rick