I just had a discussion with a user trialing Photoshop CC 2017 for Windows. He could search Adobe Stock anywhere else but inside the Libraries Panel.
The Error Message read: Photoshop Libraries. "Sorry, something went wrong while searching Adobe Stock. Please try again."
The solution in this case was to uninstall "Web Companion" by Lavasoft.
Just want to alert the Adobe Stock community the possibility of Web Companion causing this problem.