DAQ No Signal in Test Window and 200284 Error

Hi!
I'm working on a university project to control the speed of a motor using LabVIEW.
My program seems to run successfully only the first time it in the day. If I try to run it again I get a 200284 error ("Some or all of the samples requested have not yet been acquired").  I've tried resetting the computer, and the devices in MAX. 
When I open the 4472 test panel in MAX, choose:
Coupling: DC
Rate: 20000
# Points to read: 2000 points
Aqusition mode: Continuous
Autoscale Chart: <check>
and press start, there is no waveform displayed on the chart. Occasionally when it does display a waveform it has a large amount of noise (spikes of up +-10V) when the reading should be 0V.
We have a PXI-1000B computer with a PXI-4472 DAQ card.  We are using LabVIEW 8.6 and MAX version 5.3.
I'll welcome any suggestions!
Thanks in advance!

Currently, I'm not seeing any signal.
It was working fine for a few days, and now it has stopped working again.  The waveform chart has been blank for at least 15min now (like in the screenshot).  All the other channels are the same (ai0-ai7).
Every time I press start it becomes grayed out but no waveform appears.  The same is true for "Acquisition Mode: Finite".  It appears to be waiting for the captured data, but nothing arrives.
So far today, I've tried: reseting the 4472 in MAX; reseting the computer; and turning everything off and starting agian after lunch...
I have ruled out the Ethernet connection as a problem.  It works fine by itself without data acquisition.  In my main program, an Error-66 comes up for that first because the Ethernet connection times out as the loop is waiting for the data acquisition read (I believe anyway).
Attachments:
MAX_test_window.PNG ‏32 KB

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