After a week of testing, I can almost surely say that the problem is indeed fixed in Windows 8.1
So I'm going to stick with this for the foreseeable future...
interesting...i use DRR in MP + Win 7, though i must admit i haven't watch much content lately using DRR. Might explain why i seen it more rarely than OP...
i'll try some more testing using DRR, i usually switch between 50Hz p, for 25fps (dvb-t FTA ) content to 23.976 Hz for 23.976fps content, then back to 50Hz...