I have retested today with B177 and I realized there is a mistake in the steps above.
If I follow them strictly, I also can't reproduce... It's all because the low setting is working as intended.
(Happends while writing instructions in the office while I should work instead, without having access to the game - lol.)
Instead you should use medium or high setting for testing.
Ok, here's the corrected (and more detaild) version:
1. make sure you're able to see any difference between the settings (blur to crispy sharp) - if not, you won't be able to reproduce it. An asphalt road works best for me as a test.
2. Use the MEDIUM-setting (asphalt in background should be blured now)
3. restart the game (the programm, not only the save game)
4. make sure you don't change any settings (best If you don't enter the settings completely until step 6!)
5. if asphalt in background is crispy sharp again you have repoduced it (cause that should not be the case).
6. check settings now. Medium-setting is still active in settings
7. reapply the setting by changing it temp. (asphalt in background should be blured finally)