Same problem as of #6 here with an 
HP PhotoSmart R507
using Ubuntu 8.10:

> Unable to mount Hewlett-Packard PhotoSmart 720 / PhotoSmart 935 (storage)
> Error initializing camera: -1: Unspecified error

According to some other related bugs, it might have to do with the camera's 
mass storage mode (being switched on here).
Note that the camera icon and name are displayed in computer:///
Double clicking on it there gives an error message à la "Unable to mount 
location. Error initializing camera: -1: Unspecified error" (German: Einhängen 
des Ortes nicht möglich. Error initializing camera: -1: Unspecified error). No 
crash, though.
Stuff used to work some time before 8.10.

Haven't tried workaround from #12 yet, but could it be that this
suggests that gphoto (something related to mass storage vs PTP mode
handling) is to blame?

dmesg:
[ 1240.072277] usb 7-1: new full speed USB device using uhci_hcd and address 2
[ 1240.237839] usb 7-1: configuration #1 chosen from 1 choice
[ 1240.451387] usbcore: registered new interface driver libusual
[ 1240.474611] Initializing USB Mass Storage driver...
[ 1240.474817] scsi6 : SCSI emulation for USB Mass Storage devices
[ 1240.475026] usbcore: registered new interface driver usb-storage
[ 1240.475033] USB Mass Storage support registered.
[ 1240.475296] usb-storage: device found at 2
[ 1240.475301] usb-storage: waiting for device to settle before scanning

gvfs-mount -li (diff):
> Volume(0): Hewlett-Packard PhotoSmart 720 / PhotoSmart 935 (storage)
>   ids:
>    unix-device: '/dev/bus/usb/007/004'
>    hal-udi: 
> '/org/freedesktop/Hal/devices/usb_device_3f0_4002_4C434E34394D39383031500_if0'
>   activation_root=gphoto2://[usb:007,004]/
>   themed icons:  [camera-photo]
>   can_mount=1
>   can_eject=0

uname -a:
Linux razor 2.6.27-11-generic #1 SMP Fri Dec 19 16:29:35 UTC 2008 x86_64 
GNU/Linux

-- 
gvfsd-computer crashed with SIGSEGV
https://bugs.launchpad.net/bugs/195976
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