With fixed 1080i 60Hz on, for some reason it doesn't show the 2-3 second blank screen if you are watching tv-recordings that are in 50Hz, it just shows them directly in 60Hz.
But if you watch a movie that actually needs to use the 60Hz mode, then it goes like this: movie starts, screen goes black for 2-3 seconds (or maybe it temporary switches to 50Hz and my TV is too slow to display the change), and image returns back (still in 60Hz mode).
Movie names are shown in the log, this latest was: GRAVITY [2013] CAM XviD IMDB 8.6.avi
DM8000 without autoresolution, just normal 1080i mode at 60Hz selected. But DM8000 is using just Dream Multimedia's software, not Vix. I just mentioned the DM8000 just in case you suspect that my TV is causing this.