Hi Andy,
Yes what Carol and Kylie mentioned above is still the solution for fixing the white map issue in ops dashboard app. All you need to do is:
1. Follow the steps Kylie mentioned above to locate the OperationsDashboard.exe.config file on your computer and open it in a text editor.
2. Follow Carol's reply above to add the following key to this file. It should be placed at the same level as other keys in the config file
<add key="useAcceleratedDisplay" value="false" />