Now I'm curious.....since I'm a platinum member, I think I'm going to buy those lights and see what it does on my machine. I have Poser 5 SR-1 and XP as well. I took a look at DAZ, thinking they may have posted a comment about this item being compatible with Poser 4 and not guaranteed with Poser 5. On the contrary, in their product review for the Global lights 1, they specifically reference use in Poser 5. Here are two tips they provide for P5: 1. If using the Poser 5 raytracing renderers, select each light and set the Shadows to 'Ray Trace Shadows' in order to get the shadows to render and get rid of the glowing nostril syndrome. Save the updated light set to your library under a new name. 2. If changing lights frequently in Poser 5, not all the lights are replaced and they start to build up, eventually leaving you with a black scene. To fix this, bring up the Python Scripts window, click on one of the blank buttons (has three dots), then load the reset-lights.py file in Runtime:Python:poserScripts. Left-click on the reset-lights.py button and all lights will be deleted and then one light will be added. You already have a "kill lights" script, but you might want to try the first tip if you haven't already.