I used to set 160 dpi because everything was sharp but too small. And everything was fine... until recent.
Now everything is blurry although I didn't changed any settings. If I change back to 96 dpi it's all good and sharp but too small. If I set back 168 dpi as it was before, I have blurry fonts.

How to fix it, and enjoy big and sharp fonts?
(this is continuation of this thread viewtopic.php?t=39431 but it's locked)