Canon has announced a firmware update for the 50D:
Please be advised of the availability of a firmware update version 1.0.7 for the EOS 50D digital camera.
Firmware Version 1.0.7 incorporates the following changes.
1. Corrects a phenomenon where captured images may tend to appear somewhat magenta depending on the scene.
2. Fixes incorrect indications on the Arabic, Romanian, Spanish and Ukrainian menu screens.
Firmware Version 1.0.7 is for cameras with firmware up to Version 1.0.6. If the camera's firmware version is 1.0.7, it is not necessary to update the firmware.
This update is available at: http://web.canon.jp/imaging/eosd/firm-e/eos50d/firmware.html