Labview GPIB-USB-HS and Network Analyzer

Hi, I have a quick question; I am currently working with an older Vector Network Analyzer and Labview for controlling antenna array measurements. Currently, we have two Labview VI's that work independently, but we would like to combine them into one to further automate our process. What I am having trouble with is writting to the VNA with the two VI's combined. I have copied the working VI and have setup the same control logic for it in the combined module as it has in the working VI, but it does not seem to work when added with the other .VI.
I am new to Labview, so it is probably a simple error, but if someone could look over what I'll attach and see if there is a solution, I would greatly appreciate it! Currently, in the combined module, there are no errors, and the first part, writing the sequence to the parallel port works, but that writing to the parallel port does not seem to trigger the VNA to become active and write the data. I can provide more details if necessary, but here are the files. The calib1.VI is required to run the VNA_Try, but nothing needs to be changed there; the VNA_Switch_Combine is the one that is not currently working.
Thank you for your help!
Attachments:
VNA_Switch_Combine.vi ‏49 KB
VNA_TRY7.vi ‏27 KB
calib1.vi ‏29 KB

Now I was able to get the program working, but while it was running yesterday, it stopped in the middle of an experiment, and I have not been able to get it to work again.
The error that I am receiving is the following:
VISA: The connection for the given session has been lost.
Previously, when I received this error, I would try a combination of restarting the computer and re-calibrating the VNA, and this would fix it. Now, however, it has been almost two days that I have not been able to get this to work. I have tried using NI MAX to detect the instrument, and sometimes it does detect it, but when it does, I still get the same error. There are other times when NI MAX does not detect the GPIB controller, but there does not seem to be a consistent reason as to why the GPIB device is or is not detected by NI MAX.
What could have gone wrong? The code remained the same, and has not changed since it worked.
Thank you.

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