And before lenny, or any of the others decide to post their usual… yes I have searched for a solution!
For some reason my command map won’t show in limbo. It’s a 512x512 24-bit targa, no compression. It works fine for the trans map and compass map, just doesn’t show at all in limbo, just the orange/black no image thingy 
The map is named mymapname_cc.tga in the levelshots folder.
Has anyone else had this problem and knows a solution?
Sounds funky. Since your compass and trans maps are working, it sounds like you might have a filename problem. It may be redundant, but are you sure the filename of the image is exactly the same as the bsp file (plus the _cc of course)? Never hurts to check twice. 
If all else fails, have you combed through the console for any error messages related to the image? It sounds like it has to be a simple mistake somewhere, since your shaders are working, but the one thing not requiring a shader isn’t.
It was truly bizarre. I checked the console and sure enough, can;t find image warning. However, it said it couldn’t find subpent_cc.tga when the bsp name is subpen. so I renaqmed the map to subpent_cc.tga and it said it couldn’t find subpen_cc.tga!!! so I renamed it back to the original and it worked. :???: Obviously there must have been something else awry that I inadvertently fixed 
Oh well, it works so I’m happy