Same deal for me. My Canon camera worked great with gphoto2 and/or auto-mounted under 8.04 & 8.10.
I recently upgraded to 9.04, and it has stopped working. Now it does not auto-mount, and gphoto2 also fails.
I have also followed these instructions to collect debug info and logs:
All the data from my system when plugging in the camera is in this attachment.