Well I guess the subject line says it all. Sometimes the menu gets the extremely ugly /usr/share/icons/Rodent/48x48/apps/xfce-unknown.png and sometimes it gets nothing for "Other". How to set an icon for that menu entry?
By changing the apps .desktop file.
Sorry, I don't follow. This is not an application but a menu icon for XFCE4 Menu>Other
There is no icon there at this moment but sometimes it uses /usr/share/icons/Rodent/48x48/apps/xfce-unknown.png
This is using the Rodent icon theme and /usr/share/icons/Rodent/48x48/apps/xfce-unknown.png is used for XFCE4 Menu>Other
It seems that there is no official icon for XFCE4 Menu>Other and even using the Rodent theme the icon sometimes just isn't there.