Created attachment 238339 [details]
jpeg which may play a role in raising the exception in question

First, an image is downloaded and saved as `filename`.

Then, a pixbuf is created with something like:
    pixbuf = GdkPixbuf.Pixbuf.new_from_file_at_size(filename, min_size, min_size)

Then, a GtkImage called `widget` is set using:
    widget.set_from_pixbuf(pixbuf)

Then, not in every case (even with the same picture data), but in many cases, a confusing exception is raised:
    TypeError: Expected GdkPixbuf.Pixbuf, but got gi.repository.GdkPixbuf.Pixbuf

Here is code that leads to this error (see lines 487-531):
http://pastebin.com/Cm1w9txS
[full project at https://github.com/AndydeCleyre/chipmunk-radio]


Arch Linux x86_64
python 3.3.0
python-gobject 3.4.2