My sources tell me that Ogilvy and American Express' Open product have parted ways.
No word on where Open is going yet. (UPDATE: Adweek reports it's going to Crispin.)
Hopefully this is just a case of AmEx doing the usual "when all else fails, blame the agency" trick for a piece of business they never quite figured out what to do with, rather than the first breach in Ogilvy's armor.
Time will tell.