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Green Slug Problem – Caused By Disk Corruption
I just had this issue the first time. Tried everything mentioned here (trash prefs, trash Constant Frames, etc.)
I noticed that after trashing prefs, I could make it go away if I used my internal disk as my scratch disk. But when I changed it to my array, the problem came back.
I ended up running Disk Warrior on the array. It found filesystem corruption and corrupt files (files I actually thought I trashed).
This fixed the problem 100%.
So anyone with this problem, first try power cycling all your disks. And if that doesn’t work, run Disk Warrior.