Safari 0.73 ignores no-repeat and instead repeat-ys if the background image is the same size or taller then the element its applied to. (image used in test is 303px tall. This problem initally noticed by me on the Netscape Fishcam page.

This header should have a non repeating image behind it that's fixed in position [height: 304px. this works ok]

This header should have a non repeating image behind it that's fixed in position [height: 303px this repeats-y - BAD]