SD CS3 project looks terrible when exported out of CS4

the main computer use edit i7 920 6gb ram, asrock x58 extreme mobo, , radeon hd4870.  has win7 64-bit on , i'm using cs4.

 

i recenlty had client wanted update project we'd done in cs3, pulled project back-up hard drive , opened cs4.  did editing, when exported , burned dvd, quality terrible compared dvd of original project.  extremely blurry , looked if bitrate low (even though exported mpeg2-dvd @ 8mbps cbr).  i've worked on , exported other projects machine using cs4 , haven't had problems.  footage 720x480 ntsc 4:3 29.97.

 

after trying several different things fix problem, including starting new cs4 project , importing cs3 version exporting whole project microsoft dv avi file , letting encore transcoding, took project our old editing computer, loaded original in cs3 , did of editing on again.  when exported out of cs3 quality looked great.

 

just wondering if might know cause this.

 

thanks.

i didn't notice quality difference myself when first switched.  not sure might cause it.

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