That is pretty weird and I can understand your concern when dealing with ephedrine. Have the pills changed such as going from a hard pill to a gel cap or something like that? Anyway, I'd call the manufacturer vs. emailing... or even both is good to see if you get the same answer
I've sent emails to supplement companies before and have waited a week or more to get a response... when I called I've always got the response right there on the phone. Let us know the scoop, I'm curious.
EDIT: Joshetc beat me to the punch