Well, I had the same light problem with importing Pz3's.

What is more annoying is trying to finish my Xmas card. I was working with it in P6 and tried it out in P7. It's 236 mb, fully base figures, fully clothed, skinned with transmapped hair within a set, morphs dumped thanks to svdl's python script. BUt still 236 mb. It takes P7 about 10-15 minutes to open it, then freezes up/unresponsive when trying to do anything -- open a tab, move camera, etc.

P6 handles it fine. So far only the default lights, too. I just finished posing the scene last night after going back to P6. P6 is a little slow with it, but at least it doesn't freeze up.

So, yes there are bugs. Or memory handling issues. SR3 for P6 solved most of the old memory issues. So for anything more than a naked women in a temple, I'll have to use P6 ;)

-- Jeff