kpelto

I’m not 100%, but I think it was in styles.css and

input[type=text], textarea {
        color: #777777;
        font-size: 11px;
        padding: 3px;
        line-height: 11px; /* this */
}

I changed the minified jquery.js to developer version from http://jquery.com/

Then I got better error message on row 4456. I added this debug code before that error line:
alert( elem.tagName + " -> " + name + "=" + value );

It resulted that the last alert before the error was:

DIV – line-height=NaNpx

I tracked down the element (by element values alerted before) that really were making the error and added some line-height value to it’s CSS. Maybe you could get more information from your elements, but I didn’t have id or title information on those..

Now it works and I changed back to original minified version.