How do I fix this sort of problem?

[Carange]

As you can see from the screenshots a portion of the map won't load at certain postitions. How am I supposed to fix this kind of error? I'm sure there are no leaks and Interlopers hasn't pointed out any errors.

 

[Da Spud Lord]

Does this look like your problem? If so, you've got a VVIS problem. Not sure what causes it, but for me the solution was to delete my brushwork around the affected area and recreate it.

 

[nᵗʰSonata]

It could also be caused by using nodraw or skybox tool textures; how does the geometry look in-editor?

 

[Carange]

Alright I've fixed it now, the vis leaves around it were kinda dodgy so I used hint brushes to create a simpler outline when compiling.