no it's not and it's not specific or unique to exph ..(as was noted contemporaneously in this very *venue* on december 4, 2009)
but then DD can get info on why this would be implemented .. illegal manipulation of stock's pps by just *one* group could cause these actions .. who knows maybe *internal* controls are being additionally scrutinized .. as we post
can't wait for the coming weeks .. and all the info that will ensue .. ;-)