Hi! I've been having this problem in the past couple of weeks, where my layers do not show the content properly and are no longer transparent, but instead they do this (see image below/attached).
They used to be transparent and show the content more clearly. I don't recall having done anything to make it change, except update to the most recent version of Photoshop CC 2020.
Is this a bug, or something I can fix? It's very frustrating when I'm trying to go through what I've done!
Is the Transparency Grid still being used on the Canvas when you hide the Background Layer?
I didn't think to check that until you asked.
No, the transparency grid doesn't display.
What are the Photoshop > Preferences > Transparency & Gamut settings?
Yay! This was indeed my problem. I don't know how that happened to end up like that, but it's fixed now.
Just a »stab in the dark« but does turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings) and restarting Photoshop have any bearing on the issue?
No that didn't work. Converting files from RGB to CMYK solves the issue. However I mostly require RGB files so this is not a useable solution other than to detect what might be causing the issue.
What are the Layers Panel’s Panel Options?
Does »Entire Layer« make a Difference?
You mean 'Layer Bounds' vs 'Entire Document'? Neither makes a difference. Only converting to CYMK.
This and the dead New Document key command in In-Design which has also persisted for two years makes me wonder what's happened to Adobe. Obviously concentrating on making more products and more money and neglecting to fix bugs. I'm guessing the venture (vulture) capitalists moved in.
That bugs happen is not much of an issue, as far as I am concerned, and many/most of the new ones seem to get fixed within two dot-releases … but some have gone unfixed for an annoyingly long time.
And when Feature Requests are implemented flat-out wrong (and then do not get fixed) or badly that seems disconcerting.