Hi all, with the EOS utility problem with OS X Sierra, just found that if i do not use the on-board USB's on my MAC then it seems to work fine. Quite by chance I connected the USB to a thunderbolt hub that i have (Startech) and the utility works absolutly fine. Use the on-board ones and it doesnt. So it might be possible to use any off-board USB. Worth a try until Canon pull their finger out.