Same story for me: regular site and app greyed out/non-functional... Not sure if eUps played a role. Both flights cancelled on today's itinerary. Computer rebook for second (already) rebooked leg through YUL was YUL-YOW-YHZ-YSJ. Tomorrow. Went to Moncton instead. All changes required human intervention at YYC & YUL - friendly and efficient but nothing functional online anywhere. Just got an AC text that my rebooked YUL-YOW flight tomorrow morning will depart 3 hour late. I'm glad I'm writing this in my kitchen instead... Think they'll inadvertently credit the extra segments for the rebook?
