Reply To: Interface Preference Not Saving

I found a way around it. Just put these two little jsx-file in the startup scripts folder (Adobe InDesign CC/Scripts/Startup scripts/):
The first one:make en ASCII-file with this line in it:
app.generalPreferences.uiBrightnessPreference=1.0; and save it as bright.jsx or any other name, but the extension has to be .jsx.
You can change the 1.0 from 0.0 (dark UI) till 1.0 (light grey)
the second ASCII-file with this line in it is for the pasteboard:
app.generalPreferences.pasteboardColorPreference=0; and save is as pastb.jsx or any other name, but the extension has to be .jsx.
0=white

Now, the prefs will remain for the interface, even if you install and update, restart after a crash. Remember, the interface prefs get reset every time an update or a crash occurs.
https://fvdgeest-dtp.blogspot.be/2013/07/dark-ui-en-indesign-cc-definitief.html
is the link for the solution above, but it’s in Dutch.