Google, everyone's BFF, indicated that a lot of people have this problem. Many possible solutions and tries later, Photostream remained PhotoStuck. One guy provided the steps to make it work. They didn't for me but I did note that the file to be deleted was in the Roaming section of the software. In January, when my Quicken software failed to open after downloading a new release, the tech dude gave me a set of steps to follow. These files were also in the roaming section. So...
In this case, make connections to solutions not people. So...it included, deleting the old software and restarting the machine. Disconnecting from the internet, reloading the software and restarting the machine. Guess what, it's:
now. Persistence is a gift!
It is especially pleasing that I am probably considered to old to like this techno geek stuff.