In the Script Dialog Editor when dragging the controls around, Opus crashes and doesn't leave any dumps. Any unsaved changes are lost.
To reproduce, try to drag any dropped control around (it must be moved from its initial position) then delete it, then use undo to get it back and try to move it again, entire Opus should crash instantly.
This problem was present since the beginning of DO12 and its Script Dialog Editor feature. I had a new computer and OS reinstalls between then and now, so it's nothing new or specific to my installation. I didn't report it before because I wasn't sure about the repro, but now I found a consistent repro.