Ubercart

I also found it gave the error when you click "Click to calculate shipping" and the order total pane shows. The throbber appended to basePath (typically http://www.example.com0, not https://www.example.com), and I don't beleive Secure Pages will override that URL. Perhaps a relative URL would work better:

Replace line 74 of ubercart/payment/uc_payment/uc_payment.js
$('#order-total-throbber').attr('style', 'background-image: url(' + Drupal.settings.basePath + '/misc/throbber.gif); background-repeat: no-repeat; background-position: 100% -20px;').html('    ');

with:
$('#order-total-throbber').attr('style', 'background-image: url(/misc/throbber.gif); background-repeat: no-repeat; background-position: 100% -20px;').html('    ');

It seems to fix my error.

Removing Drupal.settings.basePath will break sites not rooted at "/". Ultimately although I would classify this as a bug in IE but it manifests itself into a rather off-putting problem in Ubercart especially for non-tech users and requires a change. My suggestion is to put throbber.gif in CSS and manipulate classes in JS. This seems to fix the IE problem, allows for overriding the throbber functionality, and in my opinion is a cleaner solution.

Changes required (tested against 2.0 beta4 in FF3 and IE7):
1. In uc_payment.js change:
$('#order-total-throbber').attr('style', 'background-image: url(' + Drupal.settings.basePath + 'misc/throbber.gif); background-repeat: no-repeat; background-position: 100% -20px;').html('    ');
To:
$('#order-total-throbber').addClass('ubercart-throbber').html('    ');

2. In uc_order.css add this:
.ubercart-throbber {
background-image: url(../../../../../misc/throbber.gif);
background-repeat: no-repeat;
background-position: 100% -20px;
}

I think the use of "$('XXX').attr('style', 'XXX')" should be moved away from for the IE bug and styling override reasons listed.