I have CS4 running on a G4/500 w/1.12GB of RAM, OS X.4.11. Yesterday, I updated the firmware on my Canon Digital Rebel Xsi from factory to v1.1.0, the newest.
Now, photos shot following the firmware update aren't recognized by Photoshop. I've updated the camera raw plugin to the latest, 5.3. It will still open images created prior to the firmware update in raw mode.
Any ideas? Canon says reinstall everything. I've not found anything on Adobe's knowledge base.