Need Help With Landscape Streaming Proxy.

I played with landscape and landscape materials. At some point I did something that turned part of my scenery into black tiles. Usually it's easily fixed with reasigning landscape material and applying it, but not this time. I tried deleting info layers and creating new. Didn't help.
The thing that bugs me most, is that when I select landscape in the World Outliner it selects only part of the landscape, and everything is applied only to that part. I tried to assign materials directly to Landscape Proxies, but it crashes the editor. I can't event paint tiles in completely different areas of the map.
I'm in dire need of assistance

 

Can i delete map tiles and regenerate them, won't I loose track data because of that?

 

Hi have you tried going into the landscape mode, then over to paint, and reselecting, create layer info? This has worked for me when i get black tiles.

 

No worries. Recreated the whole level. Lost 50 miles of track but learned few valuable lessons.