Ok, more data: when I tried to import the newest photos from my camera,
it looks like it rejects almost every single thumbnail. This is from
when importing directly from camera:

--->8---

=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries 
used by your application.
=================================================================

Stacktrace:

  at (wrapper managed-to-native) GLib.Signal.g_signal_get_invocation_hint 
(intptr) <0x00004>
  at (wrapper managed-to-native) GLib.Signal.g_signal_get_invocation_hint 
(intptr) <0xffffffff>
  at GLib.Signal.get_Handler () <0x0001c>
  at GLib.Signal.voidObjectCallback (intptr,intptr) <0x00060>
  at (wrapper native-to-managed) GLib.Signal.voidObjectCallback (intptr,intptr) 
<0xffffffff>
  at (wrapper managed-to-native) Gtk.Object.gtk_object_destroy (intptr) 
<0x00004>
  at (wrapper managed-to-native) Gtk.Object.gtk_object_destroy (intptr) 
<0xffffffff>
  at Gtk.Object.Destroy () <0x0001a>
  at Gtk.Widget.Destroy () <0x0000d>
  at FSpot.Driver.Main (string[]) <0x006d1>
  at (wrapper runtime-invoke) System.Object.runtime_invoke_void_string[] 
(object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:

        mono(mono_handle_native_sigsegv+0xde) [0x81565ee]
        mono [0x8122e28]
        [0x1de440]
        [0xd8a2a5]
        [0xd8a1f5]
        [0xd90ed1]
        [0xd67d56]
        /usr/lib/libgobject-2.0.so.0(g_cclosure_marshal_VOID__VOID+0x49) 
[0x93ebd9]
        /usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x12b) [0x93183b]
        /usr/lib/libgobject-2.0.so.0 [0x941f31]
        /usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x8c7) [0x943167]
        /usr/lib/libgobject-2.0.so.0(g_signal_emit+0x29) [0x943329]
        /usr/lib/libgtk-x11-2.0.so.0 [0x114c041]
        /usr/lib/libgtk-x11-2.0.so.0 [0x1246a41]
        /usr/lib/libgtk-x11-2.0.so.0 [0x1252d06]
        /usr/lib/libgobject-2.0.so.0(g_object_run_dispose+0x50) [0x933ed0]
        /usr/lib/libgtk-x11-2.0.so.0(gtk_object_destroy+0x7e) [0x114bd4e]
        [0x3db11f4]
        [0x3db11ab]
        [0x3db1186]
        [0xfe19aa]
        [0xfe07c3]
        mono(mono_runtime_exec_main+0x62) [0x80996f2]
        mono(mono_runtime_run_main+0x1b9) [0x80999d9]
        mono(mono_main+0xe47) [0x805d4b7]
        mono [0x805c162]
        /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xdc) [0x20f8cc]
        mono [0x805c0b1]

--->8---
and here's a small snippet of what I get when importing from a directory 
containing the thumbnails (gphoto2 -T):
--->8---

open uri = file:///home/erik/tmp/thums/thumb_IMG_0997.jpg
read = 589
approximate quality = 52
System.NullReferenceException: Object reference not set to an instance of an 
object
  at FSpot.JpegFile.get_Description () [0x00000] 
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_0997.jpg
read = 589
approximate quality = 52
System.NullReferenceException: Object reference not set to an instance of an 
object
  at FSpot.JpegFile.get_ExifData () [0x00000] 
  at FSpot.JpegFile.GetEmbeddedThumbnail () [0x00000] 
  at PhotoStore.GenerateThumbnail (System.Uri uri) [0x00000] 
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_0997.jpg
read = 589
approximate quality = 52
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_0997.jpg
error checking orientation
open uri = file:///home/erik/tmp/thums/thumb_IMG_0998.jpg
read = 589
approximate quality = 52
open uri = file:///home/erik/tmp/thums/thumb_IMG_0998.jpg
read = 589
approximate quality = 52
System.NullReferenceException: Object reference not set to an instance of an 
object
  at FSpot.JpegFile.get_Description () [0x00000] 
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_0998.jpg
read = 589
approximate quality = 52
System.NullReferenceException: Object reference not set to an instance of an 
object
  at FSpot.JpegFile.get_ExifData () [0x00000] 
  at FSpot.JpegFile.GetEmbeddedThumbnail () [0x00000] 
  at PhotoStore.GenerateThumbnail (System.Uri uri) [0x00000] 
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_0998.jpg
read = 589
approximate quality = 52
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_0998.jpg
error checking orientation
open uri = file:///home/erik/tmp/thums/thumb_IMG_0999.jpg
read = 589
approximate quality = 52
open uri = file:///home/erik/tmp/thums/thumb_IMG_0999.jpg
read = 589
approximate quality = 52
System.NullReferenceException: Object reference not set to an instance of an 
object
  at FSpot.JpegFile.get_Description () [0x00000] 
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_0999.jpg
read = 589
approximate quality = 52
System.NullReferenceException: Object reference not set to an instance of an 
object
  at FSpot.JpegFile.get_ExifData () [0x00000] 
  at FSpot.JpegFile.GetEmbeddedThumbnail () [0x00000] 
  at PhotoStore.GenerateThumbnail (System.Uri uri) [0x00000] 
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_0999.jpg
read = 589
approximate quality = 52
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_0999.jpg
error checking orientation
open uri = file:///home/erik/tmp/thums/thumb_IMG_1000.jpg
read = 589
approximate quality = 52
open uri = file:///home/erik/tmp/thums/thumb_IMG_1000.jpg
read = 589
approximate quality = 52
System.NullReferenceException: Object reference not set to an instance of an 
object
  at FSpot.JpegFile.get_Description () [0x00000] 
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_1000.jpg
read = 589
approximate quality = 52
System.NullReferenceException: Object reference not set to an instance of an 
object
  at FSpot.JpegFile.get_ExifData () [0x00000] 
  at FSpot.JpegFile.GetEmbeddedThumbnail () [0x00000] 
  at PhotoStore.GenerateThumbnail (System.Uri uri) [0x00000] 
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_1000.jpg
read = 589
approximate quality = 52
open uri = file:///home/erik/Photos/2006/10/2/thumb_IMG_1000.jpg
error checking orientation
Stopping

--->8---

-- 
f-spot crashes while trying to generate a thumbnail for a particular photo
https://launchpad.net/bugs/54566

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