image-loading module not found

After upgrading to Matplotlib 0.61, I am getting the following error:

Unable to load image-loading module: C:\Program Files\Common Files\GTK\2.0/lib/gtk-2.0/2.2.0/loaders/svg_loader.dll

The path is correct, the file exists, I wonder if the mixed path seperators is causing trouble? I cant find the location of this exception in matplotlib to look into it, where should I look?