Game does not 'reset' map after you get an error?

[LGX]

I'm new to this game engine and I'm having some problems. Basically I have made a little test map that works just fine. I recently added two shadow casting spotlights that overlap, I got that "FATAL ERROR" message. Ok no big deal, I guessed maybe the engine doesn't support two overlapping shadow casting lights. The problem is however, when I remove the lights and go back to the way my map was before (back when it worked fine) I still get the error!

In other words, I'm still getting the error even though I reverted back to my old map that used to work. The only way to 'solve' this apparantly is if I redo all the configs, restart the level editor and save the map again. This is extremely annoying and time consuming, am I missing something or..? Why does the error continue to plague me even if I remove the cause of the error? That doesn't make any sense.

I doubt the problem is related to my PC, I work with many engines such as UE3, CryEngine3, Source and an indie OpenGL engine, they all work fine.

Help is appreciated.

LGX

edit:

I think the problem is solved, it didn't have anything to do with lights or the editor itself. I had 3ds Max running in the background plus some other stuff. I closed those applications and so far I haven't gotten any more errors.