First of all you were not right saying that disabled Anisotropic filtering caused blurry textures that time
Sorry, but that's not the case. Your screenshot shows two entirely separate problems:
1) An altitude conflict caused by another scenery in conflict, which result in the default runways shining through the airport
AND
2) Blurred textures CLEARLY caused by the lack of anisotropic filtering.
The "buildings under ground" wasn't very easy to spot, because your screenshot is not very clear. I only replied to the two obvious things. You might have noticed or not that, by enabling anisotropic, THOSE blurred textures in YOUR screenshot should go away, but they surely are.
Now, you might probably confusing the blurred textures I'm referring to, with the lack of the higher resolution textures that comes with the scenery, that are not visible BECAUSE of the scenery conflict, but that's an entirely different case of blurred textures: it's the low-resolution background mesh which is lacking the higher resolution layer, because of the altitude conflict.
After removing AP_KDFW.BGL i have all the buildings back on the ground and on that blurry places now i can see the default scenery. AFX also sees no addon, only the default airport. So it's a bit weird. Any advice?
You shouldn't remove the AFCAD that comes with the scenery and the fact that by removing it, you now see buildings, clearly proves there's still a conflict.
I can only repeat and confirm, this can only be caused by ANOTHER scenery in conflict. Don't touch files in the fsdreamteam\KDFW\scenery folder, they are all fine, your problem lies elsewhere.
If you can't find it, we can arrange a session with Teamviewer, so I can have a look at your system. PM to arrange that.