only other thing to try is check that "Middle-click Paste" is set to ON in gnome-tweak-tool.
Try running xev and clicking the buttons with the mouse in the window. I see the button event when Middle-click Past is ON but not when it's OFF.
only other thing to try is check that "Middle-click Paste" is set to ON in gnome-tweak-tool.
Try running xev and clicking the buttons with the mouse in the window. I see the button event when Middle-click Past is ON but not when it's OFF.