Default [Q] unable to write/delete files in internal storage/sd

Problem description:
  • I'm unable to delete files or create new ones in my internal storage/sd.
  • I can read files that are already there.
  • I'm also able to read/write from a PC
  • It seems that permissions are not set properly for this partition (?)

  • Note 3 model SM-N900w8 from wind mobile.
  • Rooted + RWTP
  • Stock ROM.
  • I did format system, data, cache, Dalvik cache at one time and reinstalled a rooted ROM.

Any help is appreciated.

Thank you!