Hi Karl,
May be PhotoPlus 6.0 doesn't support correctly psd file format. I'm not too familiar with this program but saw on their website that the newest version (9.0) has better psd support: "PhotoPlus 9 allows you to import, edit and even export graphics in Photoshop’s PSD format."
The psd file we supply can be normally open by Photoshop 7.0 and above to CS, Fireworks MX and Paint Shop Pro 8 as well.
Ognen