AbleCommerce Shopping Cart Software

We're running fairly customized AbleCommerce 7.0.4 on a site, http://www.makaboo.com. We've customized it so the user can personalize the item prior to adding an item to their cart. This has been working fine for years but we just noticed that in IE8, the cart wasn't updating properly with the latest item. Under IE8 (and perhaps earlier versions but not IE9 or any other non-IE browsers), the Page_Init and Page_Load functions of our ConLib/Custom/Basket.ascx.cs are not getting called when the user is taken to the Basket. I can put my cursor in the URL bar and hit enter over and over again and it still doesn't get called. If I hit F5 or click the Update (in AbleCommerce) button, they do get called. I can reproduce this consistently on both our test instance and live.

Has anyone else seen this? Any idea what might be causing it? Seems like it has to be server caching but it seems weird it only happens under IE8.

[UPDATE]
I've explored this further now... using Fiddler, when I'm on the Cart page and put the cursor on the URL/Location Box and hit enter, no traffic occurs. So, there's got to be some Javascript that is intercepting the Postback or some other browser caching issue. Any ideas how to solve?

I removed the UpdatePanel wrapping /Conlib/Custom/Basket.aspx thinking that could be related to the issue but it made no difference.

I was able to work around this issue by adding a random querystring parameter to the cart URL from our personalization page. While it's not the perfect solution I can't think of any reason it would break. But still, I'd like to figure out a better solution so this workaround is necessary.

We just ran into a situation where the buttons on the basket page didn't work in IE 8 or Safari. It was because the client had put some email signup code in the footer that was actually an html form and that created two form tags on the page. (The page worked OK in Firefox.)