Lots of problems in last few days!
Photoshop CC 19.1.5 (latest release)
I upgraded PS at the same time as installing a new extension. I noticed the following problems at that time. I have tried uninstalling Adobe CC in its entirety and starting completely fresh, but it has not helped. I also tried installing previous version with no plugins/extensions, and that didn't help either.
1. Start screen does not always appear. When opening PS first time of day it will display the start screen. Most of the other times it does not. Nor does it show if I close all files. The problem’s actually intermittent as another time I closed all files the start screen appeared, but most times it doesn’t! It is definitely checked in preferences.
2. I previously organised all my brushes and then exported them to retain the folders. I imported those to my fresh copy then quit PS in order to save them. Next time I opened they were not saved. Imported just 1 'folder', quit PS, reopened and it was fine. Imported more, quit, reopened and all gone again.
3. Layers. When clicking the eye to hide a layer it doesn’t always work (intermittent problem again, but most times doesn’t). I click to hide and then have to select another layer before it will hide. Same as when clicking to display, I have to select another layer in order for it to appear. Just found out that this also happens when changing the blend mode. In order for it to take effect I have to select a different layer.
These are the only problems I have come across so far as I have been pulling my hair out trying to sort these ones out. Hopefully I won’t find more!