Background-subreport missing on some pages

[tdtappe]

I added a background section to some report. In this section I put a subreport that contains an image. The strange thing: the subreport (background image) is missing on every second page. Pages 1, 3, 5, ... are fine. The same approach seems to work with another report. But I don't see any major difference between those reports that might cause this behaviour. The background section itself is correctly printed on every page. It looks like as if there was a printWhenExpression on the subreport checking for odd/even page numbers. But of course there isn't such a thing. Any idea?