more info gentlemen:
I do not have the capability to try DVI unfortunately---the Samsung TV has only component in for 1080

the 2nd DVD player is outputting at 480i, so i felt it may be wrong to blame the Zenith since im outputting from it at 1080...
I cannot try output at 720p as tv does not support this either, & i did bump the zenith output down to 480p & i was having difficulty telling if the problem was still there as it was late & i was groggy

(if it IS there, it's not nearly as drastic as under 1080)
if its my tv, its bad because it was a $$$ investment for me, if it's the Zenith, also bad because of their scarcity

doh!