Thanks for the suggestion, but that didn't seem to handle the situation. I still get this error and in fact, it even occurs with the "Source Ch 0" being the one changed! So, I don't quite understand it. Since the .gif, I added a string to monitor BOTH X and Y labels and they both exhibit this problem. The string being displayed is both incorrect and does match what the X/Y axis labels are. It appears that even if the the value (numeric index) of the channel selection is updated, the property of it (the text value) is not updated.
Note that this *does* appears to work with direct changes to any other channel's source - that is, NOT from the initialization shown here.
Is it possible that I need to have different parameters selected for the property nodes? Is it possible that the delay executes first?
Thanks,
Jason