Painting Landscape but sections wont load

im just staring to paint my landscape and while i was switching textures the area went grey and said compiling shaders. after it finished it stayed grey and i cant paint over it or anything. is this a bug or did i do something wrong?

does anyone else have this issue?

Actually, I just figured it out! You just need to go into your Outliner, select all of the LandscapeStreamingProxies, and then in the Details pane, reload your Landscape Material. This reloaded the missing texture patches for me.

I have this issue as well. You ever find a fix?