I'm gonna apport some new information. If you create a new mac osx User, it will work. So the problem it is ralated with tha EOS Utility installed settings. Even though you delete thed app, and re-install it, the setings remain. I'm on my way to find...
By the way, with an other software (HeliconRemote) the live video works perfectly. But it is only dedicated to several specific functions, so I need urgently to solve the problem with EOS Utility
Same here, I've instaled several versions of EOS UTILITY (3.12 3.13 3.14 3.15.. and the last one 3.16.1.3) and always I get a grey screen. I have a MacBook Pro M1 and eos 6D mark II, both updated softwares and firmwares! I'm going crazy and I ca...