Missing icons in gnome3

I don't know why, but today my icons in gnome3 were gone. I was able to click on the areas and get the spefic functionality. So the next step was a deeper look into .xsession-errors

I found some errors like this:

Gtk-WARNING: Theme parsing error: gtk-widgets-assets.css:280:73: Couldn't recognize the image file format for file '/usr/share/themes/Adwaita/gtk-3.0/assets/primary-toolbar-raised-button-border.svg'

The solution was very easy. Just to rebuild /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache:

# gdk-pixbuf-query-loaders > /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache

Found the solution here .