I'm a (french) webmaster of two sites with magento. I'm not magento developper but i try to understand it in order to improve myself.
I discover a bug on my two magento 1.8 and the same on a new magento 1.9. When I'm on the cart page and i want to estimate shipping or update my cart, magento redirects me on index.
But this problem is solved when i put yes on "redirect to cart page after added product to cart" in admin.
I find it strange because it was working. I tried to understand it and looked in code/core/mage/checkout/controllers/cartController.php. I found function _goBack and probably it's the problem.
Do you have a solution or something else which can explain this problem ?
Thanks a lot guys