Hello,
I have discovered a nasty bug on Windows 10 64 Bit using the latest Photoshop Ver. 20.0.4 and previous PS versions regarding changing the size/value via mouse scroll. Here is a video demonstration:
https://streamable.com/3jh9n
Mouse scroll only works within the window frame, if you try it outside, it is broken.
This is a huge problem for many people's workflow, most Photoshop tools are affected ( I also think other Adobe Programs ). The clone stamp tool with clone source is nearly unusable...
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I have found the culprit and a temporarily solution:
In Windows 10 go to Settings -> Devices -> Mouse -> Turn off "Scroll inactive windows when I hover over them"
If you disable this Windows 10 feature everything works as it should be!
I think all Windows 10 users are affected by this bug because the feature "Scroll inactive windows when I hover over them" is turned on by default and nobody knows about this temporarily fix. I hope you can cooperate with Microsoft to fix this issue as fast as possible.
Thank you