not Santa Cruz either...cannot say "which brand" but its one of the bigger brands (not Specialized, Trek or Giant though...)
unfortunately its not the paint that cracked, we have used T-Cut and Iso alcohol to inspect this area and it seems to be a structural failure rather than a cosmetic crack in the paint layer, and when you look closely at the aluminium brake insert there is a suspicious sharp edge which the crack seems to have started from?
no problems with the manufacturer though...another frame on the way