If you just updated photoshop to the new version via creative cloud which is Photoshop 2015.5, there are some big changes especially as it relates to Refine Edge and Masking. I’m just now starting to review these changes and naturally it’s slowed me down a bit. I’m sure I’ll get used to them eventually lol.
Here’s an article that explains the changes and how to modify your preferences. Also the video below explains the major changes. To go right to the changes related to masking, skip to 13:56.
Change is always difficult and it annoyed me that I had to learn something else but seems it’s the way of the world these days!