Content URLs return 404 error in French but not in English.
After setting "number duplicate URLs" to "yes", purging URLs and cleaning the cache, all my links return 404 error (except English content URLs).
I bought and installed the VirtueMart extension for joomSEF and there is some change.
In English (default language) : my categories that usually appear on the left hand are gone but when I click on the products that appear in the center of my homepage, I am correctly redirected to the products pages (url : us/category/product, it's correctly rewritten).
Some other VM modules are missing (e.g. the best seller one) but other aren't (e.g. the cart one).
My content urls return 404 error.
In French : my categories on the left appear but every link on the page returns to the homepage, though it's correctly rewritten (fr/category/product) OR every link returns a 404 error (without changing parameters, just waiting).
Another point concerning url rewriting and joomfish, my content urls are rewritten for instance "fr/section/my-french-page" but return 404 errors. But if the url is "fr/my-english-page", it works.
I have to fix this issue ASAP so if you're quite sure to be able to solve this problem if I buy support time, I will consider it.
Let me know if you need further information.