"Could not claim the IO device": Canon PowerShot A620, Edgy

I cannot import photos from my Canon PowerShot A620 in Ubuntu Edgy which was working fine in Dapper. gnome-volume-manager-thumb pops up an error dialog:

"An error occurred in the io-library ('Could not claim the USB device'): Could not claim interface 0 (Operation not permitted). Make sure no other program or kernel module (such as sdc2xx, stv680, spca50x) is using the device and you have read/write access to the device."

My lsusb output is :

Bus 004 Device 005: ID 04a9:30fc Canon, Inc.
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000

Output of grep 30fc /etc/udev/rules.d/45-libgphoto2.rules :

SYSFS{idVendor}=="04a9", SYSFS{idProduct}=="30fc", MODE="0660", GROUP="plugdev"

The output of id is :
uid=1000(saurav) gid=1000(saurav) groups=4(adm),20(dialout),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),109(lpadmin),111(scanner),114(admin),1000(saurav),1001(vboxusers)

So everything seems to be in place. But still the problem persists. Importing photos as root works fine.

Thanks in advance,
saurav