My customer's website, www.hillsideeducation.com/store/ seems to work ok on Firefox and IE, but in Chrome, I keep getting main_page=page_not_found. I can navigate directly to items via the categories and the pages pull up correctly, but when I try to add an item to the cart, it goes to main_page=page_not_found. It also happens when I try to login - I can input my id and password, but then when I hit Login, I get main_page=page_not_found.

I have another store on the same server and it works fine in Chrome.

The store is at 1.5.0 and I have export email addresses installed.