OpenLP does not open on Ubuntu (Studio) 14.04

I am running Ubuntu Studio 14.04 and I have installed OpenLP 2.0.4 from the Software Centre.

However, OpenLP does not start.

It started the first time and took me through the First Time Wizard, but once it had done that, it did not start, but just hung with the start-up logo.

It does not start properly if I restart, log out, or even kill and run it from a command line. It just shows the start-up screen and then does nothing.

Does anyone perhaps have a suggestion? Thanks!

Here is the output if I run OpenLP from the command line:

~$ openlp

(python:3240): GLib-GObject-WARNING **: cannot register existing type 'GstObject'

(python:3240): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(python:3240): GLib-GObject-CRITICAL **: g_type_register_static: assertion 'parent_type > 0' failed

(python:3240): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(python:3240): GLib-GObject-CRITICAL **: g_type_register_static: assertion 'parent_type > 0' failed

(python:3240): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(python:3240): GLib-GObject-CRITICAL **: g_object_new: assertion 'G_TYPE_IS_OBJECT (object_type)' failed

(python:3240): GStreamer-CRITICAL **: gst_object_ref: assertion 'object != NULL' failed

(python:3240): GStreamer-CRITICAL **: gst_allocator_register: assertion 'allocator != NULL' failed

(python:3240): GStreamer-CRITICAL **: gst_object_ref: assertion 'object != NULL' failed

(python:3240): GLib-GObject-WARNING **: cannot register existing type 'GstFormat'

(python:3240): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(python:3240): GLib-GObject-WARNING **: cannot retrieve class for invalid (unclassed) type '<invalid>'

(python:3240): GLib-GObject-CRITICAL **: g_boxed_type_register_static: assertion 'g_type_from_name (name) == 0' failed

(python:3240): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(python:3240): GLib-GObject-CRITICAL **: g_boxed_type_register_static: assertion 'g_type_from_name (name) == 0' failed

(python:3240): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(python:3240): GLib-GObject-CRITICAL **: g_boxed_type_register_static: assertion 'g_type_from_name (name) == 0' failed

(python:3240): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

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