Internal Storage probems

I installed a new rom just to try out the S6 themes and decides to go back to my old rom RoboMix via TWRP , so i restored the old backup booted in the system and my apps cannot acces to my internal storage , all the permission seems to be fine everything seems to be fine on RW, i cannot download , my viber , whatsapp , snapchat and all other apps that needs internal storage permission dosent work , yes i can go in to the app but it dosent show the files any help nice , if i flash a fresh Robomix rom it works normal , but only when trying to do a Restore it does this .