Still searching for an answer. I stripped out all the codes that I experimented with and now I'm left with "http://www.donna-hartney.com/wp-login.php?action=postpass" when I input the password (or even leave it blank for that matter). I thought it may be since it is a custom theme that I wrote myself, but I checked against another site I wrote and there is no apparent difference, and it works fine from there.
I ran a validator and only seeing errors within WP code (I've noticed this on other sites, but eitherway it didn't make a difference). I also tried deactivating all plug-ins, as there are a couple that include submit buttons (Subscribe2 and Ultra Simple PayPal Cart) as thinking that may be interfering, but that has no effect either.
The URL of the test page is http://www.donna-hartney.com/shop2_15 and the password is "xxxx".
Any assistance will be greatly appreciated.