'gsignal.c: signal 'child-added' is invalid for instance 'xyz' of type 'GtkMenu''

[dorkbox]

This is a known appindicator bug, and is rather old. Some distributions use an OLD version of libappindicator, and will see this error.

The fallout from this issue (ie: menu entries not displaying) has been worked around, so the menus should still show correctly.

See: https://askubuntu.com/questions/364594/has-the-appindicator-or-gtkmenu-api-changed-in-saucy

[dorkbox]

We now hide GTK warnings (such as this) for non-debug builds, so this should never be seen in production.