yes, my needs are indeed fairly modest, though higher than just Preview. And I do admit that some of the functions of PSE are missing, most of them I never needed. For some of the others, when it comes to automatic repair options, I have other software that I use. So, considering Adobe's present path or non path on supplying an updated version, I took the chance to use another program, which I know works well with Leopard and my machine.
I did try the functions in Pixelmator that I need in connection with the Scan software I use (Silverfast) and found this combo to not only be sufficient for my needs, but also more reliably running. Considering the short time this software has been on the market, I would also expect it to improve further.
From what you are writing, I think I did indeed make a layer from a selection in Pixelmator, but again, I may understand something different from what you are saying.
Overall, and this does not only apply to PSE 4, Leopard has been the most troublesome and timeintensive systemupdate I ever bought from Apple, and that is going back to the Apple II.... I wish I had planned the installation for a time, when I had more time 😉
Dirk