[Miles Adam] “(HDTV 1080i in sequence settings).”
That’s an interlaced sequence.
[Miles Adam] “If I import the same logo into a different project which is set at HDTV 720p then the image is perfect. How do I overcome this aliasing in 1080i? “
What happens when you set the canvas to display both fields at once? Regardless, interlaced media always displays with jagged edges on a computer screen but will be just fine on a TV monitor (if you have it connected via an I/O box). Unless it’s for TV, change your sequence setting to 1080p and see if that helps.