product must be in at least one Category

[2p12p1]

So i seem to have run into a kind of big problem here.

 

Every time i try to add a product, i get this error: " product must be in at least one Category " and also " This product must be in the standard category "

 

and when i try to select a category it only shows one category, even though i have created multiple categories.

 

This is the only error i get, and i have tried all solutions out there, but nothing have worked so far :/

 

i'm using the newest prestashop 1.6.1.1

 

Any help appreciated, since i cannot add any products to my website for this bug

Edited September 1, 2015 by 2p12p1 (see edit history)

[NemoPS]

Only 1 category? The root one? Do they show up correctly in the catalog > Categories view? Bring up the dev console and see if you have any JS error