Is there a limit to the amount of "Stuff" that Poser6 will allow in a scene?

A scene I'm working on has 8 Spotlights 3 are spots & 5 are points. Poser allows me to add more but I don't get any effects. If I delete or turn one off the new light then takes effect.
It's odd? Is It? They allow you to add more but don't make them work?
Will they all render I didn't try?

Also while I'm thinking of it...
Is there any other limits on content?
Clothing, Clothing per charactor, Props ect...

Many Thanks!

Scott