yeah, looks like your gdk-pixbuf2 package got broken somehow
Get into gslapt, and re-install it. I have this version gdk-pixbuf2-2.23.3-i486-1
and it works fine.
I can confirm that a downgrade to gdk-pixbuf2 version 2.23.3 fixes the problem. However, it looks like gdk-pixbuf2-2.24.1 was intoduced with the new build of gimp-2.8.0 and is a dependency of gimp-2.8.0, gtk+2-2.24.10, and gegl-0.2.0
So I think for a fix we should persue building a new xscreensaver same version with a higher build number, but built against the new gdk-pixbuf2-2.24.1.