Greetings,
I use psp 7 and an older version of the Nvidia plugin. The new one gave me faults that made psp crash.
A little thing that I noticed is that when you save. PSP pops out a few messages like "your gonna lose alpha layers" "image will be reduced to one layer" blah blah blah. I just click ok on the little pop-ups till I get the plug-in window, choose the format I want and click save. Some how it saves the alpha layer and all the other layers correctly. I think the Plug-in is a little quirky is all. I normaly save the image to a tga format first then convert that to a dds format. all works good.
Older Plug-in (I accept no responsabilty for anything that may or may not happen to your pc as a result of using this file version)
Cheers,
Sorak