For some reason Powershot needs to be plugged into the USB port on MacBook Pro twice to transfer photos. The first time it charges and the second it is ready for transfer. Is this a Canon thing? A Powershot thing? Vixia Camcorder does not do this but transfers video right away. MacBook Pro is slow at charging so I always use the Canon Power adaptor to charge the battery anyways. Anyone else experienced this? I wish there was a way to turn that off so Powershot would transfer photos right away.