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

[LGX]

Something about 'Renderer #0', I will write it down when I get it again.

This is really weird, for some reason my map works fine again, this 'FATAL ERROR' seems to have a will of its own. I will do some further experimentation to see if I can corner the bastard.

edit:

Not sure if this makes any sense, but I no longer get the error if I use the 'Save as' function rather than 'Save'. I used to get the error when using items, multiple shadow casters, certain meshes. But now they all work fine.

/confused