I have an ET10k Upgraded from Vix 3.2.036 to 4.2 and hit the same problem as others using ET8k. Even HD is not as sharp as it was with 3.2 and SD has vertical lines/bands, very visible on poorer film/program source. Also 4.2 is very slow to change to Radio source, whereas 3.2 is instant. Gone back to 3.2.036 and great picture quality again. So will stay there. My VU+ Solo2 has 3.2.035 and is fine and will leave that well alone. Old adage seems to step in here, IF IT AIN'T BROKE, DON'T FIX IT.