Internal storage mount or permission problem (Oneplus One) - Android Q&A, Help & Troubleshooting

Hello all,
I've been flashing rooms on the phone for quite a while now, but last weekend i flashed a new CM14.1 ROM onto the phone with the new GAPPS with it. Before doing this i ofcourse wiped the needed partitions in order for them to work right. However, since i've done this and flashed the new software, the phone doenst have access to the internal storage while being booted into the system (OS)..
When i boot into TWRP, i have full access to the internal storage and i'm able to create new folders and copy/cut/paste files onto it. Down here, you see i've created a new folder using the PC while its booted in TWRP.
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When i try to do this while its booted in CM14.1 (android 7.1.1, but i think any ROM i'd flash) this happens:
To translate this from Dutch to English: "The new folder couldn't be created on this location. The device isn't responding anymore or the connection has been lost".
When i browse to the internal storage through the OS itself, it does show up. However, i dont have any access to create new folders or files or to change them:
Also when i try to take a picutre using the camera, it says this:
Even when i enable developer options and giving root to both apps and adb, it still doesnt have the required access to perform these actions:
Also going to the gallery, it says that there is no storage available:
I also looked up some info about the partition, which might be useful for those who have some knowledge about this.. This is what i found using the app "Diskinfo":
And i also used the commands ls -l to show the permissions of the /data/media/(and)0/ to see what rights are giving out:
As you see here, the app itself didnt have access to go to the storage location untill i gave it "su" rights. Does this mean the entire OS doesnt have access to this location because it simply doesnt have the right permissions for it?
If anyone has any suggestions or wants to help me figure out what is wrong, please feel free to reply here or through a PM. It would be highly appreciated.

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///Edit
After searching around on the web i came across a post where someone said that running the TWRP advanced option "Fix Context" would reset all permissions that you normally dont do yourself. So i've ran that, it ran for like 0.5 second before being finished. After rebooting the phone into the system (OS/Android) all problems were solved and permissions were set right.
Therefore my problem is resolved now, and this topic could be closed ^^