Form submit with Return key stops working in IE 6-8

Question

Hello,

I ran across a bug with form submitting with the Return key in IE and wasn't able to find any documentation.

Take a HTML form with an image submit button, then change the "disabled" attribute to true on one or more fields in that form, than change it back to false or remove it and IE won't submit the form with the Return key any more.

Example page: http://ufd.googlecode.com/svn/trunk/issueExamples/15.html

So I am wondering if anyone ever encountered this issue and would be able to provide any solution?

Thanks!

Discussion on this issue: http://code.google.com/p/ufd/issues/detail?id=15