Website login fails on iPad 2 Safari after iOS6 Update

Upgraded to iOS6 9/19/2012.
I just spent half an hour troubleshooting why a site I developed for a client fails its login. Passwords are salted and hashed in Javascript, POSTed to an AJAX PHP page to compare password against stored salted password in database, then user is redirected to where they need to go. This site has always worked on the iPad, which is one of the site's most favored features.
Logging into the site no longer works. I've tested this issue on my PC with no problem using Firefox, Chrome, Safari, Opera. I've also tested on my iPad 2 using its Chrome and Mercury browsers with no problem.
The problem only occurs on iPad's Safari browser, and just started happening today. The only difference between today and yesterday is the iOS6 upgrade. Therefore, it stands to reason that iOS6 Safari is the problem.
The PHP running in the background that actually compares the user input to the DB credentials no longer matches the hash of the salt/password hash with the nonce. This command in iOS6 Safari gives completely different results than any other browser:
$rehash = hash("sha512", hash("sha512", $salt . $password) . $nonce);
I have absolutely NO idea why or how this command is affected by a browser. I'm telling you, this only not works on the iPad 2 iOS6 running Safari. I've tried clearing History, cookies and the like, and I get the same thing every time.
I'd like to downgrade back to a previous version of iOS6. It's fine to have my iPhone in iOS6, but I use my iPad for development, and I need to revert back.
Ideas? Thoughts?

You may want to check this out.  We were seeing login issues prior to finding this.
http://stackoverflow.com/questions/12506897/is-safari-on-ios-6-caching-ajax-resu lts

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