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The xfce panel has disappeared. When I run xfce4-panel the panel starts and works like a charm, but shows:

(xfce4-mixer-plugin:1816): libxfce4mixer-CRITICAL **: xfce_mixer_get_track: assertion `GST_IS_MIXER (card)' failed
(xfce4-mixer-plugin:1816): xfce4-mixer-plugin-CRITICAL **: xfce_mixer_plugin_set_card: assertion `GST_IS_MIXER (card)' failed
(xfce4-mixer-plugin:1816): xfce4-mixer-plugin-CRITICAL **: xfce_mixer_plugin_set_track: assertion `GST_IS_MIXER_TRACK (track)' failed

How do you restore the xfce panel state?

Xubuntu 10.04 (with Xfce 4.6).

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"mixer" makes it sound like an audio issue. It may just be the volume adjuster part of the panel that is having trouble loading. – Jarvin Aug 18 '10 at 18:58
up vote 1 down vote accepted

I still don't now the actual reason for this failure, but It resolved itself after I checked "Save session for future logins" and restarted.

The panel can also be restarted from the command line using:

xfce4-panel -r

Or the more verbose:

xfce4-panel --restart
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Reset the panels:

xfce4-panel --exit  
rm -R ~/.config/xfce4/panel  

If xfce4-panel --exit doesn't work, try:

xfce4-panel --quit

Using xfce4-panel 4.11.0 (Xfce 4.10).

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Unfortunately I'm still getting the same errors after this reset. (I'm willing to try something harder ;) – Itamar Bar Lev Aug 19 '10 at 15:39
Go into synaptic (if you can) and delete all the packages that come under the search "xfce panel" that don't look important. – digitxp Aug 19 '10 at 22:18

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