Is it Nvidia cards only? Also what drivers are you using? Any feedback will be useful as a reference point for all users.
I would define blurries as ground textures being blurred not aircraft or airports or autogen, refreshing textures clears the problem but they return very quickly.
1: video card you use
2: drivers you have in use
3: do you use application controlled AA
4: any specific settings that help or cured the problem.
5: Anything else I mised out

I have rebuilt cfg with no joy
I look forward to your input
Cheers Tony