I've finally found someone on the phone at AC who knows what they're doing. Seems like the Flex (L) fare is a new one, and it's glitchy...still coding as Standard, i.e. 50% miles. So I have to go through Aeroplan to escalate to Air Canada Customer Relations to get this credited. Problem is that Customer Relations just wrote back to me saying "we don't deal with missing miles for flown segments, please contact Aeroplan." Around and around we go...