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For some reason, my xfce panel disappeared. When I run xfce4-panel on the terminal the panel starts and works like a charm, but it 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

I have no clue of how to start understanding this problen. Does anyone know how to deal with such thing? I'm using Xubuntu 10.04 (with Xfce 4.6)

Thanks!

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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. – Dan Aug 18 '10 at 18:58
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2 Answers

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You can try running this to reset the panels (probably the easiest way):
xfce4-panel --exit
rm -R ~/.config/xfce4/panel
xfce4-panel

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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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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.

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