Not a problem, but it does intrigue me.
I use Eos Utility to download my CR2 RAW files direct from my camera. For the very first time ever today it started showing me a "Quick Preview" of each image as it read, then uploaded it.
I don't believe I've changed anything but I did update the camera firmware recently. Could that be doing it or have I inadvertently changed a setting somewhere? I certainly don't need it.

