im only guesing from what you said but did you shoot in non-widescreen then render in widescreen.
need more info on settings to make a better guess.
Nope. Although I've realized it only happens when editing in "Desktop" editing mode. If I switch to HDV 720p, it's good (but I need to work in Desktop mode sometimes, because I work with various frame-sizes. HDV 720p forces 1280x720, with no option to change it).
What are the full specs. of your source footage?
If you have mixed sources, you can edit each in a different Sequence (as of CS4) with unique Presets, including Desktop (Custom) where necessary.
Trying to mix different types/sizes of media in the same Sequence will often lead to major problems.
My source footage is YUY2 (RAW), 720x480, but this has also affected other timelines with other files (different sizes and codecs).
By the way, here's a diagram of what's happening:
Things might be a lot easier if you were to use footage from a VIDEO camera.
It's a big mix of sources (video camera, stock footage AVI's, images/PSD's, internet videos, etc).
I am having almost exactly the same problem
which is why I logged onto these forums. I'm really
hoping someone has the answer
*EDIT* I found that changing the Preview File Format codec
to Microsoft RLE solved my problem