Hello,
It is possible that you are seeing the consequences of LabVIEW compiling code written in parallel. More specifically, if you have code in parallel (not connected by dataflow, but in the same block diagram) LabVIEW will split execution time between those parts of your code. Previously you were likely manually starting two separate programs, which inherently adds a delay between the start of the programs, allowing the first program to get sufficiently far in its execution; we could be seeing the consequence of this. It would help if you could be more specific about the details of your setup and code (such as 1. which instruments are connected to which ports? 2. are you writing a command to your instruments and then receiving data as a response? 3. do you rec
eive any errors? 4. if you do receive errors, which errors do you see and where in your code do you first see them?).
Repost with some more information (perhaps a screen shot or your code) and we can get a more definitive answer!
Thank you,
Regards,
JLS
Applications Engineer
National Instruments