P: Color Blend Mode displays wrong colors; sometimes crashes

Did you try the workaround proposed in this thread? Does it still have issues when "Legacy Compositing" is checked? 

Preferences > Performance > Legacy Compositing



Post your system specs as well to help Adobe employees debug this. Such as graphics card info, os version, etc.

I have exactily the same problem also.  Windows 10.

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1. Background layer
2. New layer fill with 50% gray, blend mode normal
3. New layer filled with solid color.

As soon as you hover over the blendmodes, Photoshop freezes.



As you can see on the picture above. No layer is selected but an image appears.

This is reproducible.

I can confirm this. Its easy to replicate on larger files. (i use a A3 Document in 600dpi havent testet the exact size when it breaks) When im using a smaller file (around 500px x 500px 72dpi) the zoom doenst break.

Just reproduced on Windows 7, and as a bonus, Photoshop crashed after I cycled through a few blend modes. The image never updated but the Navigator did. Crash report sent.

I'm also having this issue. Only on my Windows machine (Win 10 Home, v1803, OS 17134.345) . On Mac OS 10.13.6, it works as expected. 

As mentioned enabling legacy compositing in preferences fixes for me too, no crashes and blending modes update on the fly and zoom works again

Can't  seem to replicate, however I'd like to know what changed in Photoshop's compositing engine.

System specs:

I was player around with what Dave mentioned above, after messing around with the blending modes changing them to different blend modes and just clicking on different options I noticed after a while they wouldn't change on the fly.
After they stop updating on the fly I noticed that zooming in and out doesn't work, this a is document zoomed in at 12800% as you can see the image hasn't zoomed in


And then when I go to Image > Image size Photoshop would crash, I was able to reproduce this quite easily

I enabled the option: legacy composition and restarted Photoshop!
Edit / Preferences / Performance Menu .....
with me worked correctly without bugs
Source: https://forums.adobe.com/thread/2547771

I cannot seem to reproduce the issue. 
Adobe Photoshop Version: 20.0.0 20180920.r.24 2018/09/20: 1193433  x64
Operating System: Mac OS 10.12.6