Still with all my dreamboxes with optical output i have no hickups only with my dm7025 i have many of them.
it seems like a sync thing (maybe not) because it is a bit like what happens when you zap to new channel. then also a hickup is there.
It is a annoying "feature" to say the least.
Every image has this "feature".
I hope it will be fixed someday.
My DM7025 has been sent to DM because of some strange reboots that turned out to be the powersupply, they said the mainboard was 100% so that cannot be the case then.
just my thoughts.