I just got some feedback from a customer on a glitch in our cart. On some products but not others, as soon as the first option is selected, a small black box appears in the middle of the screen. It looks like the box that would normally have the wheel indicating its processing the input. It doesn't disappear and locks any further mouse clicks. It happens in Firefox & Internet Explorer but not Chrome.
I would attach an screen shot except I can't find the button here to attach it.