Do you have LabVIEW 7.0 anywhere that you could use to open up the code written in LabVIEW 6.1? My suspicion is that there is some sort of datatype that is being passed into an Unbundle that has changed between versions of LabVIEW.
If you do not have LabVIEW 7.0 anywhere that you could use, you can post the code to the forums and I can do it for you and see if I can see where the error is coming from too.
Thanks!
Kileen C.
NI