Tyro,
My guess is that it is something in the CIN code that you wrote that is not functioning correctly, but you are not passing the error back to LabVIEW. I suggest starting there.
Otherwise, you will have to post much more information on your issue that what you have here. Give as much information as possible so that it makes solving the issue much easier.
Randy Hoskin
Applications Engineer
National Instruments
http://www.ni.com/ask