Are you using a high-resolution monitor?
What is your monitor resolution setting?
Have you tried uninstalling and reinstalling the program (always a good idea when you upgrade an operating system)?
Yes, i am using a high resolution monitor. I also have PSE 14 and it doesn't seem to effect it.
I have not tried uninstalling.
Photoshop Elements 14 now has settings for working on high-resolution monitors, like the Retina display.
Premiere Elements does not. Yet.
I'm not sure what else to recommend except an uninstall/reinstall.