To reproduce:

1. Download and open attached "repro948496.zip" project.
2. Go to Menu ->Function ->Bug to trigger the script.
3. Notice the console output.
4. Go to Player settings and check Multithreaded rendering option.

Expected result: After setting PlayerSettings.MTRendering the value is also updated in Player Settings.
Actual result: Radio button is not updated. According to PlayerSettings.MTRendering value is changed, but in the Player Settings it is not.
Values in script and in Player Settings seem to be desynchronized what leads to confusion about which option will be executed in build.

Reproduced with: 2017.3.0a7, 2017.2.0b11, 2017.1.1p1, 5.6.3p3, 5.5.4p4.

Notes: Multithreaded rendering is located in Android player settings.