Can curtain-induced seat shifting happen after OLCI?
 

How soon before departure does BA lock down the position of the curtain between ET and CE? Currently for a flight next week I'm sitting in the second exit row (row 12) with the seatmap showing CE up to row 9. If I get to OLCI at T -24 and I can still select the seat does that mean I'm 'safe', or could BA extend CE and move the curtain (bumping me back) even after that?

I think I've seen it move after OLCI started, given that I was then unable to change to a preferred seat easily (so was checked in).

I usually aim for front of cabin, and so go for 2nd row of ET to allow for a minor move. Also check in but not get BP to allow further moves. But I don't think they'll move curtain back three rows in final days so expect you'll be OK.