I am having a strange issue with my product filter (layered navigation) not working, I have narrowed this down to the URL paramaters being lost because of a 301 redirect.
If I go to the URL... http://domain.local/styles/?attribute_style=258
I would expect to land on a category page with a result filtered by attribute style. This does't happen, the products aren't being filtered. This seems to be because the above URL goes to a 301 redirect and forwards me to the URL... http://domain.local/styles/ without the query string. I am pretty sure this is related to a configuration setting as I'm sure it was fine before I imported a pre-existing database.
Does anyone have any idea what is causing this and how I can resolve it?