GTK theme and icons fail to load
Sometimes the MATE session fails to theme itself properly and shows up with ugly looking panels and icons. This is due to a race condition with MDM and it usually only happens in live mode. There are a number of workarounds for this. If it happens rarely, simply retheme the session by typing "mate-settings-daemon" and "killall caja". If the problem persists, you can add a "killall gnome-settings-daemon" and a "killall mate-settings-daemon" in the PreSession's default script for MDM. Alternatively you can switch to GDM3. Note that users reported similar issues between GDM and Gnome and even LightDM and Unity.
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