Question "Value's don't match" on login

I've got a fresh Kunena install and succesfully synced existing Joomla users into Kunena, but when I try to log in via the front end I get a red warning message that says "values don't match".

running joomla 1.5.21 and
Kunena 1.6.3

Hello,

Are-you sure that this account is correct ? Do you have tried with an another account ?

Yes, the account is correct. None of my accounts are able to login, but if I login from a core Joomla login page with the same credentials and then navigate to the forum it shows me logged in fine. I am only getting this error on the Kunena login box. The error is a little AJAX tooltip box that is white with red text. It floats over top of the login button and disappears on click.

The HTML that displays the error is pasted below. This appears just before the closing body tag after the login button is clicked:

<div class="validity-modal-msg" style="left: 533px; top: 350px;">Values don't match.</div>

We may be able to help you faster if you can provide a more complete picture about your website. Do you think you might be able to do that for us, please?

I've sorted it out. I was using the Helix template (from ThemeForest) and there is a JQuery validation library included for the Joomla registration component (Validity). This creates a bit of conflict with your forum for some reason or another (Validity's fault, to be sure). I don't really need excessive validation, so disabling it did the trick.

Thanks much for your time! You guys are invaluable, really.