GTK

[blueberry]

I believe that's a libpng error, not GTK. I had the same error when opening images a while back. Using the convert tool from imagemagick fixed it for me.

[SELECT ALL] Code:

convert $filename.png $filename.png

I'm assuming AC gives that error when opening the various png files it uses for the GUI. sdl_image depends on libpng, so it could be that.