I'm using Poser 4, no ProPack on an old computer with only 128MB of RAM, and have never had a single problem with these light sets. What you're experiencing with the lights are almost certainly not a bug inherent to the lights. I understand that you're frustrated, but you're making false accusations about a very fine product. 1. You might have seen that the ad copy (or maybe it's the readme, can't remember) clearly states that the loading the lights won't remove previously loaded lights. If you have ProPack, you can find Python scripts in FreeStuff here which will remove all lights quickly. Sorry, I don't know who the providers are, but a few searches should turn them up. If you don't have ProPack, try not to load the lights until everything else in your scene is set up. Load the lights last. You might want to individually delete the default lights, easy to find because they'll be labelled "Light 1," "Light 2," and "Light 3." This shouldn't really be necessary IMO, because a mere three lights which are "off" won't eat up much memory. However, it can't hurt. If you've loaded the Complex Lights after having tried other sets with numerous lights, you'll have to delete them manually, if indeed memory is an issue. 2. The freeze-up problem sounds familiar. That's a problem of Poser's, not DAZ'. It's related to RAM so far as I can tell. Try saving your .pz3 before you render. You might also want to use a small app that frees RAM up just before you render. I use MemMax for this, and it seems to help. Save the file, then run a RAM booster, then render. 3. There are any number of reasons why your render is coming out too brightly. Are you rendering with shadows turned on? It looks like maybe you're not. That's the first thing to check. If you are, I don't know... hard to say without more info. All I can say is that while nothing will come out looking exactly like the advertising pictures, my own experience is that the thumbnails included with this product depict the results of each set as accurately as anyone could expect. When I use "Studio 1," the results are very similar to Anton's render that you posted. Finally, if none of this or anyone else's responses here help, try contacting DAZ directly. They're as friendly as can be, and will probably refund your money if you really aren't satisfied with the product. Good luck, and keep trying. I don't mean to be harsh on you, but this isn't a buggy product. I find it to be indespensible.