If I set the x or y offset of a background image to non zero, and also set "repeat", then image does not appear (the background appears white).
That is, I change
body { font: x-small sans-serif; background: #f9f9f9 url(headbg.jpg) 0 0 no-repeat; color: black; margin: 0; padding: 0; }
to
body { font: x-small sans-serif; background: #f9f9f9 url(headbg.jpg) 10 5 repeat; color: black; margin: 0; padding: 0; }
This seems to happen is in 1.5.2 and 1.5.3 (at least). It had worked well in previous versions.