Hi Bob, thanks for posting! I am sorry to hear that the monitor is not displaying while connected to our dock and I will be happy to help.
Based off of your description we’ll want to reinstall the DisplayLink drivers and run the DisplayLink cleaner tool to make sure that the software used by our dock is in a good state. To do so, please follow these steps:
Disconnect the dock from the system and please remove the power cable from the dock so it turns off completely (this is important so the unit resets). Please keep it disconnected until the last step.
Uninstall any and all software with ‘DisplayLink’ in the title that is present from within the Control Panel -> Programs and Features. Don’t worry if these entries are not present or if the process does not work, just move onto the next step