Nancy,
OK, if you're placing the subreport on the report footer, I'm guessing the subreport is something you want to run at the very end.
I don't think I've ever tried placing a subreport in a report footer, I've usually placed it in a section of a group footer, but it all depends on the type of report you're creating.
I'll check it out with one of my test reports to see what I come up with. Only other thing I can mention to check is whether things like the 'can grow' option is checked for the subreport.
I'll let you know if I find something.
Kevin