Errrm - it shouldn't - Breeze browser is designed to work with Canon RAW format.
There just *may* be a problem with th camera and/or the storage card when saving RAW format (which, as you know, produces much larger files than TIF of JPG).
Try viewing them in an alternative viewer such as YarcPlus - see click here
This will help to determine if the Breeze software is playing up. If Yarc won't display RAW either, I suggest you try another storage card, or contact Canon for a replacement camera.
See also click here for some useful stuff about working with RAW.