One thing I have noticed about using process_cq. Don't use it to repair any government buildings unless you want an immediate CTD. If you are repairing one of your own govenment buildings (I used to sometimes do this to avoid rebellion CTD's) in a settlement you lost for a turn or so, go ahead and repair it (important if it's a type 4 and the client ruler is still alive and entering the city), but let it repair in the "end turn" process like normal. Make sure you do a manual save before doing anything like repairing gov't buildings. I've been giong about it this way for a little while and it seems to cut down the # of (non-recurring ) CTD's in my games.