title: Cannot find X.509 certificate using FindByThumbprint
body: <p>I am getting the following error when I try to instantiate an instance of a third party web service client...</p>
  
  <pre>Cannot find the X.509 certificate using the following search criteria:
  StoreName 'My', StoreLocation 'LocalMachine', FindType 'FindByThumbprint', 
  FindValue '[value in here]'.</pre>
  
  <p>The strange thing is that we have this working on another development machine, but it is steadfastly refusing to work on mine. We have added the certificate to the machine's certificate store in the same way (as far as we can tell) on each machine.</p>
  
  <p>Can anyone offer any suggestions about how to troubleshoot this?</p>