Canon has released new firmware for several model including 40D. The release note mention the fix for followings:
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.
The new firmware can be download from the link to Canon site here
Where are 1.0.6 and 1.0.7?
Now 1.1.1 is unofficial available