I've been setting up a store in version 1.5.6.2. I enabled multistore per the directions in the docs and everything went fine. Then I created a new store.
As soon as the new store was created, all backpages were replaced with a 500 Internal Server Error page.
I deleted the new store and everything was fixed.
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As an experiment, I installed a new version of Prestashop (1.6) at a different address (http://coffeecityusa.com/newsite.) I did not add products or do any customization, all I did was enable multistore. Everything looked fine until I created a new store, then the exact same thing happened: all backpages were replaced with the error (see it here: http://coffeecityusa.com/newsite/5-tshirts).
I've googled this problem and can't seem to find anybody have the same issue. Any ideas?