If you use the Build XY graph, and don't have it set to clear data each call, then it should show all the data just fine. But you CANNOT use the run continuously button. You must use a while loop around your code. Using run continuously is like pressing the run button, over and over and over again. It would clear the XY graph at the start of the VI.
I don't see any reason why you wouldn't be able to record any measurements. Unless there is something quirky about the conversions to the dynamic data type and the way it is being passed to the Write LVM file express VI's. Also check that your counter tasks are running okay. Put probes on wires where necessary to see what data is being passed. through.
