Definite crashes, not hanging System, as my Mac Mini 2018 sends a crash report each time. I have seen AL4 unresponsive in the Finder too. As I’ve been mostly creating in Jup 8v, Prophet V and CZ V it’s most likely in one of those presets. Running Mojave at the moment as I’m waiting for Universal Audio to update their drivers for Catalina. AL4 fully updated. Seems very tempremental just crashing as I try and alter a typo. ♂️ Going to have another go today to see if I can pinpoint the problem.