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Hi, I have the same problem running ROS Indigo on a Linux Mint 17 (trusty) image.

tobias@ros-engine:~/find_obj_2d_ws$ rosrun image_view image_view image:=/camera/image _image_transport:=comprsed init done opengl support available

(image_view:43558): GLib-GObject-WARNING **: invalid uninstantiatable type '(null)' in cast to 'GtkWidget'

(image_view:43558): GLib-GObject-WARNING **: instance of invalid non-instantiatable type '(null)'

(image_view:43558): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

Can you tell how to patch image_view?

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