funwithstuff

I posted the original tweet. The problem is with a spot color channel, which I created in the first place by picking a color name from a color book 20 years ago. Now, the on-screen color (PANTONE 130 CVC, an old color name) goes black in Photoshop 2023, but is still a recognisable yellow in an older Photoshop 2022. Without the screen reference, you don't know what it's supposed to look like, so designers working with multiple spot colors could have a tricky time.

More info in this video: https://youtu.be/OBs2-2KcN-w

I'm the author of the original tweet, and I made a video which answers a few of these questions.

https://youtu.be/OBs2-2KcN-w

Essentially, the biggest issue is with spot color channels in Photoshop files. If you don't have a license for the spot color used in the file, it goes black, with no clues other than the name left behind. If you can look it up somewhere, you'll be OK, but it's a real pain.