I will say, that when you normalize huge audio, cancelling can take a LOOOOOONG time. Years ago, I was told it was my interface, but I now have 3 interfaces ... line 6, M-Audio and RME and all 3 have the same problem. Sometimes, I'm trying to normalize some small thing and I make a mistake and it tries to normalize all the tracks in the project for the duration. Since I often record for 3 hour sessions, this can be a LOT of tracks for LONG time and Escape doesn't cancel the operation for what feels like forever. It's time to get up and get a drink when I make that mistake.