P: Program error with fade up from or to black on background layer

Yes, it is working.

Great. Thanks.

This should be fixed in the 21.1 update that went out last night.

Hi Doug,
I'm glad to hear enabling Legacy Compositing resolved the issue for your students.  I'm sorry for any inconvienance there may have been.  We have our engineers working on a fix for this issue.  We appreciate your patience on the matter.

Andrew

Andrew, I have not had time to check it with grading and other things, but several of my students who ran into the issue tried it and said it worked. - Doug

Hi Doug,
Can you please try enabling Preferences -> Performance -> Legacy Compositing.  That should resolve the issue temporarily.  Please let us know if that helps.

Sincerely,
Andrew

I reinstalled 20.0.7 and it works fine with the same file. So you definitely have an issue with Fade With Black in 21.0.0.

And one more tidbit. I threw a second color layer on and put an FTB on it. Moved it to the bottom layer. As long as I have the two color layers turned off, everything works fine. If I turn on either one, the scrub head stops at the FTB and the program throws off the error.  I also turned off the layers and let the scrub head go to the end, then turned them back on, first one, then the other. When I went to try to pull the scrub head back either time, it would not move and threw off the error. That black fade seems to be the nub of the issue.

When I just tried to save the PSD, it also threw off a program error saying it could not build a preview, and it would not save. Again, this happens with any fade to or from black on that underlying layer, but as soon as I took that black fade off that layer, it saved fine. Absolutely nothing else has change on my computer or with PS except the PS auto update to 21.0.0.