I am currently running 25.8.4.2 on Windows 10. Ever since updating, I have had troubles with indenting on my writings.
I indent using the tab button. The paragraph stays in that format until I hit Enter, at which point it goes back to the left side of the page. I have used the Styles feature as well as the indentation bar at the top and nothing is being saved. I end up having to go back to the beginning of the paragraph and hit Tab.