Update Shutter Website Page

Added in a section for potential issues/solutions, detailing the first issue I've run into with getting the shutter started up.

Author: Johnhaug223

docs/source/user_guide/hardware/images/Shutter_ModelDebug.png

@@ -52,3 +52,28 @@ shutter.
                 max: 5.0
 
 |
+
+------------------
+
+Potential Issues and Solutions
+-----------------
+
+**Issue:**
+
+Shutter opens and closes immediately upon starting any acquisition mode, no traceback error occuring.
+Model Debug log files indicate that the shutter is correctly recognizing when it should be open/closed.
+
+.. image:: docs/source/user_guide/hardware/images/Shutter_ModelDebug.png
+    :align: center
+    :alt: Examples of debug messages indicating opening/closing of the shutter
+
+**Potential Solution:**
+
+Try a different port for the digital I/O on the controller, making sure to update the port in your configuration file as well.
+Some NI devices (e.g.PCIe-6738) have port/sample size limitations. If the port/sample size is exceeded, the shutter will not open.
+For example, on our `NI PCIe-6738 <https://www.ni.com/docs/en-US/bundle/pcie-6738-specs/page/specs.html>`_
+using port 0 for the shutter causes this issue, but switching the shutter to any port 1 channel fixed it.
+In comparison, for the `NI PCIe-6259 <https://www.ni.com/docs/en-US/bundle/pci-pcie-pxi-pxie-usb-6259-specs/page/specs.html>`_,
+using port 0 had no averse effects.
+
+