There should be no write privilege issues, unless you made permission changes. I'm able to enable/disable subs without any problems. Just play a video, pull up the navigation menu, select video, then disable/enable subs, then set default for all videos (if needed). Works every time.
So, let's get this straight. Are you saying that when you select "Videos / Files
" then you source, pull up the context menu, select Change Content
that it shows None
by the source type? or that when you pull up the context menu it only has Set Content
If that's right, then somehow you have a folder permissions issue and relates back to your subtitle issue and you need to adb shell into the device and see what the permissions are set for your .kodi or .xbmc (as well as lower) folder are (/sdcard/Android/data/org.xbmc.xmbc or org.xbmc.kodi/files/.xbmc or .kodi). However, if you pull up the context menu, select Change Content and it still shows Movies for the type, then you just have a scrapping problem and you need to manually scrap.
It's hard to say what might have happened, but as I haven't heard anyone else having this problem or haven't seen it myself, it appears to be a one off issues only affecting your install.
EDIT: I just noticed this on github: https://github.com/xbmc/xbmc/pull/5860
which maybe related to your content issue.
Try the 12/03 Nightly
when it is pushed out, the fix should be merged into that build.