Canon announced a firmware update for the EOS Rebel XSi / 450 digital SLR camera. Update version 1.0.9 fixes several problems that have been reported to Canon with Auto Exposure Bracketing, Live View and Playback. The exact fixes are:

Fixes a phenomenon in which AEB (Auto Exposure Bracketing) shooting does not operate normally under specific conditions.
Fixes a phenomenon in which the Live View exposure simulation warning indication does not properly display during Live View shooting.
Fixes a phenomenon in which images cannot be played back after continuous shooting when a printer is connected to the camera or a video output terminal is used.

The previous firmware version is 1.0.4 — if your camera uses this version, updating is recommended.

Further information about the update is available on Canon’s update page.