Hi veer...
I may be wrong on this, but the reason why FPSC is probably crashing on you is because you probably have too many entities in the room and outside.
FPSC can only handle so much polygons.
For example, if you have a room with 4 dynamic lights, about 30 entities, and you go outside and have buildings, trees (which I've discovered take up a lot of polygons), more entities, etc. that may cause your FPSC to crash.
What I would do...
1) Remove any unnecessary entities and/or lights that you don't need. Carefully examine the map. For example, does the outside ABSOLUTELY, POSITIVELY need that tree or park bench you so eloquently placed there? If it doesn't, remove it to save poly count.
2) Also, try to make as many entities static. to do that, click on the entity, whether it's a statue, a piece of cake, a table, a building, a fire hydrant, whatever...and see if that entity is dynamic. You would know because the aura around the entity will have a green color. Change those to static entities by pressing Y on your keyboard after the entity has been highlighted. Why? Because I learned from someone on here that static entities mesh or blend with the background when building your game thereby saving you some poly.
Remember, the lower the poly count, the faster and smoother your game will run.
Hope this helps. Just my 2 cents. Good luck on your game.
If anyone feels this info is wrong, please correct me. I am still a newbie that is in learning
--King Cobra