After updating of system an error appeared in my ArchLinux. When almost starting any GTK3 application, error “GTK3: Couldn’t recognize the image file format for file *.svg” appeared.
The problem is in loaders.cache file. To fix it on Arch just run from root:
gdk-pixbuf-query-loaders > /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache