Steve, LabVIEW may not be populating your graph when you call the subVI. It's possible that you will have to open the front panel, print the graph, then close the front panel. This is particularly the case if you are using an older version of LabVIEW (pre-5.0). Knowledge Base (KB) 18FB2692 explains this problem more thoroughly. Use this url to review the KB:
http://digital.ni.com/public.nsf/websearch/433544E20D6C423486256602004B2E59?OpenDocument Hope this helps! Marcus G. National Instruments
