plank doesnt recognize X11 and dont start

[Maloe123]

I am using Arch Linux with 4.18.0-g8efcf34a2639 Kernel with XFCE4 and xfm4.
Since the reboot after the complete system upgrade yesterday (except for the Kernel) plank does not start anymore.

Output from plank -d:
[INFO 12:24:56.922161] [AbstractMain:229] Plank version: 0.11.4
[INFO 12:24:56.922183] [AbstractMain:230] Kernel version: 4.18.0-g8efcf34a2639
[INFO 12:24:56.922197] [AbstractMain:231] GLib version: 2.58.2 (2.58.1)
[INFO 12:24:56.922212] [AbstractMain:234] GTK+ version: 3.24.2 (3.24.1)
[INFO 12:24:56.922226] [AbstractMain:237] Wnck version: 3.30.0
[INFO 12:24:56.922241] [AbstractMain:238] Cairo version: 1.16.0
[INFO 12:24:56.922254] [AbstractMain:239] Pango version: 1.42.3
[INFO 12:24:56.922267] [AbstractMain:241] + Cairo/Gtk+ HiDPI support enabled
[INFO 12:24:56.922281] [AbstractMain:247] + XInput Barriers support enabled
[CRITICAL 12:24:56.922308] [AbstractMain:257] Only X11 environments are supported.

X11 is definitly running, I am starting it with startx.
echo $XDG_VTNR
1
echo $XDG_RUNTIME_DIR
/run/user/1000

[Emnl (emnl+)]

Had the same issue.
As user Do Quyet (mr.quyetdx) suggested here: https://bugs.launchpad.net/plank/+bug/1811492
adding export XDG_SESSION_TYPE=x11` in ~/.xinitrc fixed it for me.
I'm using Arch with Kernel 4.20.3
plank 0.11.4.24-0a84Arch
xfce4 4.12.1

[Juan Simón (simonbcn)]

Same problem