I had the same issue. you probably were using Memoji as profile picture. You have to remove it. A workaround is to ssh in your iMac (if remote connection was activated) and hide faulty profile: sudo dscl . create /Users/hiddenuser IsHidden 1Anyone running Sonoma on iMac15,1 (Retina 5K, 27-inch, Late 2014) with AMD Radeon R9 M290X 2 GB?
I tried OCLP v.1.0 with Sonoma and the screen was flickering every 3 seconds or so and I had to reinstall everything, now I'm scared to try again 😅