Indoor room modeling rendering: 3Dmax lighting when a Target Point light will die.

You this problem I really have not encountered

But there are only two reasons One is the problem of your software itself (and other software or system incompatibility and other factors, right) Two is your model

But, listen to your expression I think the cause of the side of the larger You can try to re-install the software

To see if it can be resolved or to provide more detailed

Let us analyze the situation. Or provide more details and let us analyze it for you.