Aliasing with progressive footage in a progressive timeline

Anyone ever experience this?
I've rendered out some 1080p Sheer codec source spots... down-converted them to 480p widescreen DVCPRO50 through QuickTime Pro. They look flawless in the QuickTime player. Obviously no fields. Pristine.
Now... when we take the DVCPRO50 footage into FCP. Create a timeline that matches the footage identically (30p 16:9 anamorphic DVCPRO50)... on playback there is all this weird aliasing going on.
Double-checked the footage..... it's definitely 480p. Zero fields. Definitely 29.97... FCP Pro file information shows it is reading it as 29.97progressive. No pulldown.... Sequence is absolutely solid. 29.97.... no fields... and yet on playback we get this weird aliasing like it has fields. Similar, but not quite exactly like watching interlaced footage in a progressive timeline.
Playback is through the Blackmagic Decklink Studio video card. Double-checked all hardware and user settings. All are as they should be....
What the hades is going on?
Much help would be appreciated...
Doug

Rather than downconverting with QT, try Compressor with with Frame Control, Resize Filter set to Best.
*Doug Stringham wrote*:
+Only when it comes into FCP does it look wonky.+
Are you sure that you don't have a footage/sequence settings mismatch? No rendering required?
Are you viewing at 100% in the canvas?
Are you viewing externally on a broadcast monitor?

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