[[SYSTEM]]
Archlinux
Azerty keyboard (France)
Xfwm 4.8.3-1 according to pacman


[[HOW TO REPRODUCE]]
Configuration Panel ==> Window manager ==> Keyboard
Here's a big array with two columns: Action | Shortcut

Enter the following bindings :
Workspace 1 <==> Alt + 1
Workspace 2 <==> Alt + 2
Workspace 3 <==> Alt + 3
Workspace 4 <==> Alt + 4

Please notice the content of the "Shortcut" column:
<Alt>ampersand
<Alt>eacute
<Alt>quotedbl
<Alt>apostrophe


[[EXPECTED RESULT]]
The shortcuts should allow the user to go to the corresponding workspace.


[[ACTUAL RESULT]]
The shortcuts won't work after a reboot.


[[TINY HACK TO FIX IT]]
Edit ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml

Look for those lines
<property name="&lt;Alt&gt;ampersand" type="string" value="workspace_1_key"/>
<property name="&lt;Alt&gt;eacute" type="string" value="workspace_2_key"/>
<property name="&lt;Alt&gt;quotedbl" type="string" value="workspace_3_key"/>
<property name="&lt;Alt&gt;apostrophe" type="string" value="workspace_4_key"/>

Replace them by those lines
<property name="&lt;Alt&gt;1" type="string" value="workspace_1_key"/>
<property name="&lt;Alt&gt;2" type="string" value="workspace_2_key"/>
<property name="&lt;Alt&gt;3" type="string" value="workspace_3_key"/>
<property name="&lt;Alt&gt;4" type="string" value="workspace_4_key"/>

Please notice the new content of the "Shortcut" column:
<Alt>1
<Alt>2
<Alt>3
<Alt>4

No problem after reboot anymore :)
Hope it can help.
Regards.