As for your issue, I don't really have any good ideas. You could try to export your feeds to file, then: mv /home/user/.feedingit /home/user/.feedingit.bak to reset everything, and then re-import the feeds. That will give you a fresh start, but I have a feeling this won't change much.
FeedingIt.py:1098: GtkWarning: gdk_drawable_set_colormap: assertion `cmap == NULL || gdk_drawable_get_depth (drawable) == cmap->visual->depth' failed gtk.main()