I recently in the last week started seeing our sales crash and users visiting site and leaving. I finally had a customer tell me website wouldn't let her checkout. I tried and it all worked. Another said the same. I tried again, it worked for me. Then I tried it with explorer and wala... couldn't log in or add product to the cart. Try to add it returns to " your shopping cart is empty ". Try to log in and it just blinks you back to main page? I have the latest version installed 1.3.9h. I have recently added a few scripts like Google checkout and a " Fast and Easy Ajax Checkout " by Numinix . I have disabled both and still nothing. I cant think of anything else I could have changed. I added a new secure cert but I cant find anything wrong with it... again.. EVERYTHING works with Firefox? Please help. Site is copstopshop.com

Thanks,
Joel