Posted for information only rather than advice sought[*]
I have been using Proshow Producer since 2007 - initially on Windows PCs but for the past ten years on macs using Parallels Desktop to run the latest Windows version. Recently I upgraded to a macBook Pro with the Apple M1 chip. Parallels Desktop worked seamlessly on it and I upgraded my Windows version to Windows 11. That must put me in a very small proportion of the number of people still actively using PP.
Producer seems to work fine but with one exception. If I use a cross-fade(blend) transition the color palette of the merged images seem to be very distorted and the transition becomes more of a jump rather than a fade.
Here's the before, after, and cross-faded images of a sample show.
https://www.icloud.com/iclouddrive/0ubhoH5Ps--wVRVCIcvm6VvZA#SlideshowWell, that's back to the old macBook I thought but then I tried publishing the test show as an MPEG-4 file and it ran perfectly. So that gives me several more years of using Producer - in my view the best slideshow app that there has ever been.
[*]Naturally, if anyone knows the magic button to press to make the color blending work correctly that would, of course, be an added bonus