PSE6 works in Yosemite using the trackpad.
I read that PSE10 work in Yosemite, but I do not recall if that person who made the claim stated they were using a mouse.
Someone stated the PSE11 allows making a single click, and it does not entirely lock PSE.
PSE12 I know makes a single click and locks the app.
The problem is somewhat odd. A partial trackpad error was introduced in PSE11, and the error became worse in PSE12.
PSE13 is claimed to work fine in Yosemite by Adobe, but a user needs to confirm the latest version works when using a trackpad.
