Mouse cursor cannot select files in Finder, and issues with Photoshop display

Ever since upgrading to Mojave I've had a couple of ongoing issues. I am using OS Version 10.14.3 on a 27" Mac.

The first is the more important: When I open finder and try to select a file or folder the cursor is unable to select it. Nothing happens, it does not open and does not highlight. I can scroll to the file/folder using the arrow keys, and I can click anywhere else on the screen with the cursor, but I am unable to select the actual file/folder with the cursor. It happens about 50% of the time. Sometimes relaunching Finder solves the issue, sometimes it doesn't.

Second issue: This pertains to Photoshop CC 20.0.3. Sometimes when working in Photoshop a small area of my canvas will randomly get distorted, pixelated colors. If I zoom in and out it sometimes solve the issue about about 10-15 seconds. It is happening at least once a day using different files. I will attach a screenshot sample. I have asked for help with this in the Adobe forums but have not found an answer.

Any thoughts on how to fix these? I have had nothing but problems since "upgrading" to Mojave. I wish I had never done it. My computer worked perfectly for 2 years until I upgraded, and now there is always something wrong with it. Ug!

Anyways, thank you in advance!