I also noticed that my dropbox can't install anything either, just says "storage full or unavailable" but my storage is fine, i have over 9gb of internal storage left.
I patched titanium backup with lucky patcher and I know once I had a message about not having enough storage but got it fix by deleting some file in /sys/app folder i think could this have anything to do with it?
P.S. I've tried fixing permissions in TWRP and it didn't help
P.S. I actually don't think any of my apps have permissions to access the internal memory. I just tired using viber and the app can't even look for a picture from my gallery to sent...
What could be causing this guys?? Could it be a bad root? What should I do, I don't really wanna reinstall my rom and then reroot, its too much work.