Viewing Canon CR2 RAW files from a Canon EOS 7D or Canon EOS 40D camera will corrupt some images. After Adobe Bridge creates a
thumbnail of the CR2 files, some images previews will show the file with corruption (large white square or discolored areas). The CR2 file then
becomes corrupt. The file is not corrupt prior to viewing in bridge, but it becomes corrupt after viewing in bridge. The file is corrupt because it can
no longer be processed with any other RAW conversion program including ACR, DPP, or BreezeBrowser. If the file is marked as read only before viewing in bridge, the image preview shows corrupt in Bridge but the file remains intact and can be processed with Canon's DPP software. This issue first occured with CS4 and the ACR 5.5 update. The problem seemed to be less prevalent with the ACR 5.7 update. However after upgrading to CS5 this problem is back and worse than ever.
When doing a detailed file compare between a corrupted version of a CR2 file and a copy of the same file before the corruption occurs it appears as if metadata has been written to the wrong part of the file (middle) instead of the beginning (header).
Operating System: Windows 7