mageia 7 beta2: problems with GTK3?

[adhefe]

Sometimes it happen that some applications refuse to start at mageia 7 beta2, be it live mode or in a fresh install. It happened to me to launch the installation in live mode and now, already installed, to launch MCC. Errors look like this (a few translations to english),

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 (mcc:11775): Gtk-WARNING **: 09:55:42.375: Theme parsing error: gtk.css:135:30: The style property GtkExpander:expander-size is deprecated and shouldn't be used anymore. It will be removed in a future version

(mcc:11775): Gtk-WARNING **: 09:55:42.375: Theme parsing error: gtk.css:142:29: The style property GtkStatusbar:shadow-type is deprecated and shouldn't be used anymore. It will be removed in a future version
Ignore the following Glib::Object::Introspection & Gtk3 warnings
No protocol specified
Unable to init server: it was not possible to connect: Conection refused
Cannot be run in console mode.

To overcome the problem, I rebooted. But maybe simply login off and on may work as well. I'll try

Thanks

[doktor5000]

No protocol specified
Unable to init server: it was not possible to connect: Conection refused
Cannot be run in console mode

Hi there, the GTK warning messages are only cosmetic and pretty much irrelevant. This looks either like a polkit/dbus issue or a problem connecting to the X server.
You can try to issue

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xhost +

and then to launch MCC again. Alternatively, switch to root using

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su -

and then try to run MCC as drakconf