In the category pages of my store only the default display settings work. For example: When I select the option to sort by name, nothing happens on the page if the default is to sort by price. But the url changes from: www.example.com/some_category to: SAME URL#!___SID=U&dir=asc&order=name.
And the same happens with the option to view (grid, list) and the display limit option (3, 6 ... All).
Note: The store was upgraded from version 1.7 to 1.8, but I can't tell you if that was the cause of the issue, because i don't know if this was working before.
Someone knows how to fix this?