First, Many of us who participate in this Forum are volunteers and quite a few only post during their working hours. So please have some patience on a weekend.
The time constant in your circuit is 220 ms or less depending on which resistors are selected. So after 1 second the voltage will be ~ 5 V. After 1.5 s, V = 5. After 2 s, V = 5. Not too interesting. Probably more interesting is to take samples at 1 or 10 ms intervals and plot that.
It is not clear what you want the Hold button to do. Do you want to suspend updating the displays? Do you want to suspend acquiring data? What do you want to happen after the Hold button is set back to False? Clear displays? Append new data to the data present before Hold? Something else? Because of the time constant the data will almost always be constant at 5 V after manual operation of the Hold button.
The reason you have problems with your hold button is that you are reading the local variable in a greedy loop. Because there is no delay in that loop, it will consume all the CPU resources available. Furthernore, no other part of the VI can run until that loop stops.
To get the buttons to all be responsive and available look at event structures and Producer/Consumer Design Patterns.
Lynn
