Read this thread !

https://www.renderosity.com/forums/threads/2979205/poser-12-colored-spots-only-show-white

you note a pretty obvious problem that was not consistent in previous poser versions but then you get told it has been fixed in the next version 13 and sorry poser 12 has had he's last update already. But it is still on sale and sorry colored lights ain't working and will not be fixed. Is this a way of handling Customers that pay in good faith ? so it seems poser 12 just has to live with only white lights .... but probably also just a unique user issue based on a system error!