I'm running OpenSuse 11 here, Banshee 1.2.1

I can reproduce the problem all the time (so I cannot currently use Banshee at all), but I don't have a specific recipe for it. Just playing anything crashes it after mere minutes. I couldn't make it crash without playing anything though.

Log from banshee-1 --debug:

[Warn  19:47:11.005] Audioscrobbler NowPlaying failed - Failed to post NowPlaying: System.Net.WebException: Error: ConnectFailure
  at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0006c] in /usr/src/packages/BUILD/mono-1.9.1/mcs/class/System/System.Net/HttpWebRequest.cs:800
  at Lastfm.AudioscrobblerConnection.NowPlayingGetResponse (IAsyncResult ar) [0x00000] in /usr/src/packages/BUILD/banshee-1-1.2.1/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs:562
[Debug 19:47:11.005] Now-playing submission already started - aborting.
[Warn  19:47:11.059] Audioscrobbler NowPlaying failed - Failed to post NowPlaying: System.Net.WebException: Error: ConnectFailure
  at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0006c] in /usr/src/packages/BUILD/mono-1.9.1/mcs/class/System/System.Net/HttpWebRequest.cs:800
  at Lastfm.AudioscrobblerConnection.NowPlayingGetResponse (IAsyncResult ar) [0x00000] in /usr/src/packages/BUILD/banshee-1-1.2.1/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs:562
[Debug 19:47:11.059] Now-playing submission already started - aborting.
[Warn  19:47:11.111] Audioscrobbler NowPlaying failed - Failed to post NowPlaying: System.Net.WebException: Error: ConnectFailure
  at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0006c] in /usr/src/packages/BUILD/mono-1.9.1/mcs/class/System/System.Net/HttpWebRequest.cs:800
  at Lastfm.AudioscrobblerConnection.NowPlayingGetResponse (IAsyncResult ar) [0x00000] in /usr/src/packages/BUILD/banshee-1-1.2.1/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs:562
[Warn  19:47:12.678] Failed to handshake: {0} - System.Net.WebException: Error: ConnectFailure
  at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0006c] in /usr/src/packages/BUILD/mono-1.9.1/mcs/class/System/System.Net/HttpWebRequest.cs:800
  at Lastfm.AudioscrobblerConnection.HandshakeGetResponse (IAsyncResult ar) [0x00004] in /usr/src/packages/BUILD/banshee-1-1.2.1/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs:417
[Debug 19:47:13.646] Downloaded cover art from Lastfm - chakuza-unterdersonne
[Debug 19:47:14.726] TrackInfoDisplay RenderAnimation: 18,00 FPS
[Debug 19:50:31.078] (libbanshee:player) bp_stop: setting state to GST_STATE_NULL

(Nereid:31764): GStreamer-CRITICAL **: gst_caps_unref: assertion `GST_CAPS_REFCOUNT_VALUE (caps) > 0' failed
[Debug 19:50:31.112] Player state change: Playing -> Idle
[Debug 19:50:31.117] Track Chakuza - Unter der Sonne (Chakuza Instrumental) (on Unter der Sonne) <00:03:22> [http://kingpin5.last.fm/user/32d410141b85fd69f73c71f2cfbf31a7.mp3] had playtime of 203214 msec (203sec), duration 202000 msec, queued: False
[Debug 19:50:31.122] Player state change: Idle -> Loading

(Nereid:31764): GStreamer-CRITICAL **: gst_caps_unref: assertion `GST_CAPS_REFCOUNT_VALUE (caps) > 0' failed
[Debug 19:50:31.993] Player state change: Loading -> Loaded
[Debug 19:50:32.000] Track Chakuza - Unter der Sonne (Chakuza Instrumental) (on Unter der Sonne) <00:03:22> [http://kingpin5.last.fm/user/32d410141b85fd69f73c71f2cfbf31a7.mp3] had playtime of -211 msec (0sec), duration 202000 msec, queued: True
[Debug 19:50:32.001] Player state change: Loaded -> Playing
[Debug 19:50:32.675] TrackInfoDisplay RenderAnimation: 17,00 FPS
[Warn  19:50:35.476] Audioscrobbler NowPlaying failed - Failed to post NowPlaying: System.Net.WebException: Error: ConnectFailure
  at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0006c] in /usr/src/packages/BUILD/mono-1.9.1/mcs/class/System/System.Net/HttpWebRequest.cs:800
  at Lastfm.AudioscrobblerConnection.NowPlayingGetResponse (IAsyncResult ar) [0x00000] in /usr/src/packages/BUILD/banshee-1-1.2.1/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs:562
[Debug 19:50:35.476] Now-playing submission already started - aborting.
[Warn  19:50:35.479] Audioscrobbler NowPlaying failed - Failed to post NowPlaying: System.Net.WebException: Error: ConnectFailure
  at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0006c] in /usr/src/packages/BUILD/mono-1.9.1/mcs/class/System/System.Net/HttpWebRequest.cs:800
  at Lastfm.AudioscrobblerConnection.NowPlayingGetResponse (IAsyncResult ar) [0x00000] in /usr/src/packages/BUILD/banshee-1-1.2.1/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs:562
[Debug 19:50:35.479] Now-playing submission already started - aborting.
[Warn  19:50:35.531] Audioscrobbler NowPlaying failed - Failed to post NowPlaying: System.Net.WebException: Error: ConnectFailure
  at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0006c] in /usr/src/packages/BUILD/mono-1.9.1/mcs/class/System/System.Net/HttpWebRequest.cs:800
  at Lastfm.AudioscrobblerConnection.NowPlayingGetResponse (IAsyncResult ar) [0x00000] in /usr/src/packages/BUILD/banshee-1-1.2.1/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs:562
[Debug 19:50:36.299] Downloaded cover art from Lastfm - nicosuave-vergesslich
[Warn  19:50:37.167] Failed to handshake: {0} - System.Net.WebException: Error: ConnectFailure
  at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0006c] in /usr/src/packages/BUILD/mono-1.9.1/mcs/class/System/System.Net/HttpWebRequest.cs:800
  at Lastfm.AudioscrobblerConnection.HandshakeGetResponse (IAsyncResult ar) [0x00004] in /usr/src/packages/BUILD/banshee-1-1.2.1/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs:417
[Debug 19:50:37.338] TrackInfoDisplay RenderAnimation: 24,00 FPS
[Debug 19:55:49.510] (libbanshee:player) bp_stop: setting state to GST_STATE_NULL

(Nereid:31764): GStreamer-CRITICAL **: gst_caps_unref: assertion `GST_CAPS_REFCOUNT_VALUE (caps) > 0' failed
[Debug 19:55:49.552] Player state change: Playing -> Idle
[Debug 19:55:49.556] Track Nico Suave - Vergesslich (Remix) (on Vergesslich) <00:05:17> [http://kingpin5.last.fm/user/969e45c197d551e39cecc1b80814789c.mp3] had playtime of 316993 msec (316sec), duration 317000 msec, queued: False
[Debug 19:55:49.561] Player state change: Idle -> Loading

(Nereid:31764): GStreamer-CRITICAL **: gst_caps_is_fixed: assertion `GST_IS_CAPS (caps)' failed

(Nereid:31764): GStreamer-CRITICAL **: gst_caps_is_any: assertion `GST_IS_CAPS (caps)' failed

(Nereid:31764): GStreamer-CRITICAL **: gst_caps_is_empty: assertion `GST_IS_CAPS (caps)' failed

(Nereid:31764): GStreamer-CRITICAL **: gst_caps_is_any: assertion `GST_IS_CAPS (caps)' failed

(Nereid:31764): GStreamer-CRITICAL **: gst_caps_is_empty: assertion `GST_IS_CAPS (caps)' failed

** (Nereid:31764): WARNING **: Thread (nil) may have been prematurely finalized