Default [Q] Rooted Huawei G6 - Apps can't access phone memory

Hi,

I have a Huawei G6 from China. I unlocked the bootloader, rooted it with vroot and installed SuperSU.

I can install GoogePlayStore and all kind of different apps from it. And they work mostly fine. But for some reason some apps show issues:

- I can't take a picture. It says "Storage full, install SD card". Although phone memory is still around 1 GB left.
- I can't open files from Dropbox. "Not enough memory, or storage full"
- ES File Explorer doesn't show local SD card
- Some apps, like Waze just won't run "Waze can't access your SD card. Make sure it isn't mounted". That one totally confuses me.

What's missing? How can I fix this?

If wrong sub-forum pls move this post accordingly.

Thanks
Andy