After reading this and some other threads you've been in, Renate, I think I've finally got an explanation as to why Coolreader's partial refresh seems to be broken in 1.2.1. I didn't know the eInk handling code had been changed, and the CR developer(s) either doesn't know or hasn't gotten around to modifying it yet (at least in the most recent CR version I've got installed). My regular NST is still on 1.1.2 so it behaves normally, but I just got a used NSTG off eBay and I've been trying to deal with that ever since.