http://sourceforge.net/tracker/index.php?func=detail&aid=1370749&group_id=4825&atid=104825 Pybliographic does not display error messages because it uses a deprecated and now dropped (as of dev-python/gnome-python-2.12.0) function. Fortunately the patch is easy.
Created attachment 73877 [details, diff] gnome_error_dialog_parented.patch Construct a workalike function and install it into the module namespace. I love python.
Upstream says that this bug is fixed long time ago. Closing as fixed.