What distro?

Is it a gnome desktop (as opposed to xfce, or something else)?

Do you have your distro's gvfs-gphoto2 package installed?

- Mike

Duh. I see you're using Fedora 14, so ignore my comments.

- Mike

gThumb 2.13.2
Arch Linux 2.6.39 x86_64
Canon PowerShot S2 IS

Can't import photos, error message: Couldn't load folder, Permission denied.
Seems for me device isn't recognized.

Installed gvfs-gphoto2, same outcome.

In terminal:
$ gthumb -i
/home/siriusb/.gtkrc-2.0:7: Unable to locate image file in pixmap_path: "stock_mail-unread-multiple.png"
/home/siriusb/.gtkrc-2.0:11: Unable to locate image file in pixmap_path: "mail-mark-read.png"

(gthumb:10904): GLib-GObject-CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed

(gthumb:10904): GLib-GIO-CRITICAL **: g_file_new_for_path: assertion `path != NULL' failed

(gthumb:10904): Gtk-CRITICAL **: IA__gtk_file_chooser_set_current_folder_file: assertion `G_IS_FILE (file)' failed

(gthumb:10904): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(gthumb:10904): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

Marking as obsolete, as this was reported for a now-unsupported version and no recent activity has occurred. 

Please feel free to reopen this bug report if the problem still occurs with a current version of gThumb.