Hi Catharina, I don't know what causes that except maybe that Vue 4 was designed based more on Poser 4 and not the PPP. I don't know that for certain, and it's just a guess. The only suggestion I have is from the E-on website: Find your Poser EXE filr and rename it from poser.exe to poser.exe. That's not a typing error, and yes it's the same name, but it seems to have worked for others for some reason. Maybe try the same thing with your PPP, as well. If that doesn't work, the only thing I could suggest is to contact support@e-onsoftware.com. They seem to have built a serial checker into Vue 4 when it comes to Poser, posibly as part of whatever deal they made with Curious Labs, but something seems to have gone wrong, when it comes to people using the PPP. Have you tried it with Poser 4 scenes, or only PPP?