Cannot arrange icons on dock or drag away

[John]

Every time I try to move an icon around on the dock or pull it away to remove it, I get this error:

[Gdk] gdk_device_get_source: assertion 'GDK_IS_DEVICE (device)' failed
[Gdk] gdk_device_get_associated_device: assertion 'GDK_IS_DEVICE (device)' failed

Using:
Plank 0.11.1
Arch Linux
Cinnamon with Muffin (default on a fresh install)

I am using the intel drivers, installed everything through pacman

[John (jmauss)]

ricotz mentioned in IRC that this is an issue with the latest upgrade to gtk 3.20.4. Works in 3.20.3 backwards

[Rico Tzschichholz (ricotz)]

https://git.gnome.org/browse/gtk+/commit/?id=358eec297204b438809692a24cc3649658dbab5a

[David Biesack (david-biesack-sas)]

Is this fixed in 0.11.2 ?

[Michael Zimmermann (sigmaepsilon92)]

not sure about the release tags but it's definitely fixed in r1562-1

[David Biesack (david-biesack-sas)]

I have

$ dpkg -l "*gtk*" | grep ii | grep 'gtk-3'
ii libgtk-3-0:amd64 3.18.9-1ubuntu3 amd64 GTK+ graphical user interface library
ii libgtk-3-bin 3.18.9-1ubuntu3 amd64 programs for the GTK+ graphical user interface librar
ii libgtk-3-common 3.18.9-1ubuntu3 all common files for the GTK+ graphical user interface li

but I still still this problem with Plank 0.11.2 .
Would an upgrade of gtk to 3.20.3 fix this? (not sure how I could upgrade -- ppa:gnome3-team/gnome3 ? )