Thanks for your report.
This is a known issue with wayland documented on
https://fedoraproject.org/wiki/How_to_debug_Wayland_problems#Screen_capture_is_not_available_with_usual_apps
** Changed in: gpick (Ubuntu)
Importance: Undecided => High
** Changed in: gpick (Ubuntu)
Status: Confir
this is a major Wayland problem. Also GIMP color picker does not work
https://bugzilla.gnome.org/show_bug.cgi?id=780375
** Bug watch added: GNOME Bug Tracker #780375
https://bugzilla.gnome.org/show_bug.cgi?id=780375
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gpick (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1704808
Title:
Gpic
** Changed in: gpick
Status: Unknown => New
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https://bugs.launchpad.net/bugs/1704808
Title:
Gpick is not working in Wayland session
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