2nd map goes black

[Khyrpa]

You could try this thing out.
First take a copy of your map file so I don't ruin it!

then open it with a notepad, (put XML as language so its easier to watch)

Then replace the performance and viewport config's with some map's ones that works.
like this

Spoiler below!

<Performance CamClipPlanes="0.05 1000" LightsActive="true" PSActive="true" ShowFog="true" ShowSkybox="true" WorldReflection="true" />
<ViewportConfig BGColor="0.2 0.2 0.2 1" GAmbientLight="true" GPointLight="false" GridSnap="false" GridSnapSeparation="0.25" SelectedViewport="3" UsingEnlargedViewport="true">
<Viewport CameraPosition="-0.513922 6.07617 178.79" CameraTarget="-0.513922 6.07617 -1.20986" CameraZoom="0" GridHeight="-1.20986" GridPlane="2" Preset="0" RenderMode="1" ShowAxes="true" ShowGrid="true" UsingLTCam="true" />
<Viewport CameraPosition="179.486 6.07617 -1.20986" CameraTarget="-0.513922 6.07617 -1.20986" CameraZoom="0" GridHeight="-0.513922" GridPlane="0" Preset="1" RenderMode="1" ShowAxes="true" ShowGrid="true" UsingLTCam="true" />
<Viewport CameraPosition="-0.513922 186.076 -1.20986" CameraTarget="-0.513922 6.07617 -1.20986" CameraZoom="0" GridHeight="6.07617" GridPlane="1" Preset="2" RenderMode="1" ShowAxes="true" ShowGrid="true" UsingLTCam="true" />
<Viewport CameraPosition="29.0746 9.18319 26.2465" CameraTarget="20.8886 1.75 30.8191" CameraZoom="1.43" GridHeight="1.75" GridPlane="1" Preset="3" RenderMode="0" ShowAxes="true" ShowGrid="true" UsingLTCam="true" />
</ViewportConfig>

Or did you mean its black inside the game?