Dynamic Lighting Issues

I have had the D.L. just pack up and not work when I use control-"L" with a token. Oddly it worked fine for my games Friday and Saturday, then acted up again when trying to build a scene for the next game.

Can you please follow Steps 1-3 of our Solving Technical Issues wiki page, taking special care to temporarily disable all browser add-ons and extensions, temporarily pause your anti-virus, and try switching browsers (for Chrome/Firefox specific issues) to see if one of those components is causing the problem. If all of that fails, please follow Step 4 , including providing all of the necessary information, so that we can further assist you. Can you explain what exactly happened? Did dynamic lighting just completely stop working?