I'm going to step in here even though I hate this fucking useless forum because i don't like to see SM maligned unfairly.

The advice you've been given above is nonsense.

Everything is installed in the right place. There is no .pyc script for the lights. You can't edit a .pyc script anyway.

The problem is that you've added the PP2014 runtime to your P11 installation, and the PP2014 runtime includes a (properly) installed version of the Reality addon that is incompatible with some of the new features in Poser 11, such as the new area lights. Reality is choking when trying to process a type of light it knows nothing about.

There is an update to Reality which makes it compatible with P11 on its way soon - you should have been notified about that. In the meantime, remove Reality from the PP2014 runtime, or don't link to that PP2014 runtime from within P11. Then get the updated Reality when it's available.