Just throwing in another tally to the 'me too' tab. Same symptoms, trying to accelerate and having flat spots, or the bike just refusing to accelerate at all until the throttle is let off and applied more slowly. There have been a couple threads on this both here and on ADV about similar symptoms as well. Some people had blockage on their fuel pump from bad fuel or the rustproff liner in the tank coming off, but most of the time the symptoms occurred during hot weather, so an issue with the venting could pretty likely as well. Might make sense as to why this seems to be mostly an ATAS problem as well, with the new redesigned tank.