Canon has released firmware v1.0.8 for the excellent Canon EOS 40D DSLR.
"This firmware update (Version 1.0.8) incorporates the following improvements and fixes.
1. Fixes a phenomenon in which Image Stabilization operation emits a sound when certain buttons are pressed, with the EF-S 55-250mm f/4-5.6 IS lens attached to the camera.
2. Fixes a phenomenon in which the Image Stabilization operation emits a sound from the lens when IS lenses are attached to the camera.
3. Fixes a phenomenon in which a part of the image looks unnatural when reviewed on the LCD.
4. Corrects errors in the Spanish and Norwegian menu screens."
[Get the firmware here]
