I'm running Fedora 23 with latest updates. I have a problem with middle-click selection paste. This kind of selection is essential for my workflow.

My main app is rxvt-unicode with a perl clipboard extention for copy/past in terminal. The code of the extention is below:


#!/usr/bin/perl
#
# /usr/lib64/urxvt/perl/clipboard

use warnings;

sub on_sel_grab {

    open my $pipe, '|-:utf8', 'xsel -i -b' or die "can't run xsel: $!";
    print $pipe $_[0]->selection;
    close $pipe;

    ()
}

How I reproduce the problem:

1) Run Gnome Wayland session
2) Run urxvt like this (I do it with hotkey):

urxvt -pe clipboard -ls -bg black -fg grey -geometry 95x25 -name Xterm -sl 15000 -C -fn '-cronyx-*-medium-r-*-*-17-*-*-*-*-*-*' +sb

3) Lock the screen with Win+L and then unlock it
4) Focus on urxvt from step 2 or run a new urxvt. Select some string in the terminal window with a mouse.
5) Try to paste with Shift+Ins and get a freeze of the window. After a while "Force Quit" dialog appears.

Paste works as expected if you at step 4 run another urxvt from existing urxvt window. No such problem in Xorg session.

Don't know where to report the problem, used this https://fedoraproject.org/wiki/How_to_debug_Wayland_problems#Reporting_the_issue as a manual.