Thanks, pbGuy.
The red in my post was my doing to highlight the details of my inquiry. The actual log listing notes for EFI from EtreCheck were in black font.
Since the EFI is causing no issues with Yosemite for you, I will rule that out as an issue for me when I had it on my MBPro - before reverting back to Mavericks, that is. IF I decide to try Yosemite again - most reluctant to do so if I an unable to determine why the MBPro freezes on start up - at least it is fairly safe to assume that EFI is not the source of the grief.
