[Solved] - Copy web address causes 4-second popup menu.

[leszek]

That still seems to be Klipper somehow.
But now with you having the old Klipper config and the new clipboard widget I would suggest removing klipper package first.
The clipboard widget should run fine without the old klipper package installed.

Then delete any old configs of it in ~/.kde/share/config/klipperrc

Hope that works then after a logout and login.