Does your Diablo Launcher hang at "Initializing" on your Mac after downloading the critical launcher update this morning?
This is a work-around which will help you play the game until Blizzard comes up with a real fix.
1. Start the Diablo launcher.
2. When it asks you for your Mac admin password to make some system changes, click Cancel instead of OK.
3. The launcher continues without hanging on"Initializing" and the Play button is enable.
4. Press Play.
Did that solve the problem?