Can't acces my sd card on CM 13

I flashed CM 13 ,a week ago, on my C1905 and everything worked fine even though it was a nighty ROM, no buggs or anything. I've decided to change my micro SD for a faster one because this was soooooo slow (class 4). I used it as an internal storage. Now when i've inserted it I cant do anything with it. It works perfectly fine on my computer. But when i put it into my phone it does nothing. My phone reads the card and asks me if i want to use it as internal or portable storage. I select internal... everything goes fine, i move apps to it, but when i try to run them, they all crash. When i connect my phone to PC, the storage is empty. When i use file manager to enter SD it says Cannot open file/folder SDcard.
What do I do? Everything worked fine with the old card and now when i insert the old one, I get the same problem...