After sampling a color with the color picker, pressing ENTER used to automatically apply and close the color picker dialog.
Now, with the latest version of Photoshop (Jan 2018 - Adobe Photoshop Version: 19.1.0 20180116.r.238 2018/01/16: 1153018 x64) - this ability is gone!
To apply the chosen color, I must focus back to the color picker dialog with the mouse, and only then will the ENTER key work again.
It's quite an absurd I installed this latest version to fix Photoshop, which is infested with an incredibly huge amount of bugs since the 2018 release, only to find out new bugs have emerged.
See here this bug in action:
Looking forward for you to quickly release a new BUG-FREE version.