After updating from 1.4 to 1.7 our Magento shop has some problems:
- Internet Explorer 9.0 users can go the cart page but can't go to checkout
- Rewriting urls problems (when adding categories or rewriting existing urls the site crashes a lot)
- One of the shops has a weird frontend with codes like .....phtml in it. All other sites are running allright.
- Some products I can't duplicate
- Structure of onvoice of English site is different then the dutch, german and french