gupnp_device_info_get_udn: assertion 'GUPNP_IS_DEVICE_INFO (info)' failed

[Steve Harrington <steven harrington comcast net>]

I've written a program using libgupnp and libvlc to access a Ceton eth6 
TV tuner. The user program has not been changed for months and has 
worked well.
I've suddenly started getting the following error:

(CetonPlay:21673): GLib-GObject-WARNING **: invalid uninstantiatable 
type '<unknown>' in cast to 'GUPnPDeviceInfo'

** (CetonPlay:21673): CRITICAL **: gupnp_device_info_get_udn: assertion 
'GUPNP_IS_DEVICE_INFO (info)' failed
Segmentation fault (core dumped)

These errors trace back to:

resource_expire() at gssdp-resource-browser.c:662
(a screenshot of the trace is attached)

The obvious (to me) suspect is a change in a system library (libgssdp, 
libgupnp, libgobject, ...) but I can find no sign that any of these has 
been updated recently.

I'm not sure how to go at this so any pointers appreciated.

I am running Linux Mint 17 with the following gupnp libraries installed 
from the Mint repository:
libgssdp-1.0.a
libgssdp-1.0.so
libgssdp-1.0.so.3
libgssdp-1.0.so.3.0.0

libgupnp-1.0.a
libgupnp-1.0.so
libgupnp-1.0.so.4
libgupnp-1.0.so.4.0.0
libgupnp-av-1.0.a
libgupnp-av-1.0.so
libgupnp-av-1.0.so.2
libgupnp-av-1.0.so.2.0.0
libgupnp-dlna-2.0.so.3
libgupnp-dlna-2.0.so.3.0.0
libgupnp-dlna-gst-2.0.so.3
libgupnp-dlna-gst-2.0.so.3.0.0

Attachment: Screenshot from 2016-04-27 11:09:08.png
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