Ok, so here is a strange thing: I have my laptop hooked up to a 2nd monitor.
On a lark, I decided to open the laptop and use the laptop screen instead, and I disconnected the 2nd monitor.
Everything in PSE 14 and my same mouse works as normal! So, you think it is still my mouse software?
BTW, I did download some driver updates, but that didn't help.
It's probably Windows 10 or the laptop.
I don't think that PSE would be aware of what you are displaying on
Normally, when you connect a laptop up to a monitor, there are 4 modes you can toggle between (very often using Fn + F2): -
1. duplicate - both screen show the same
2. external monitor only
3. internal screen only
4. extend from internal screen to external monitor
So you are saying that 3. is ok but 2. is not
Since the hardware hasn't changed, it looks like Windows 10
If it is PSE 14, I'm afraid that there is no way that Adobe will bring out a patch for it.
Brian