Hello Brant,
Thank you for the provided details.
Allow me to ask one more thing - after configuring connection properties for RDP and clicking the "Save" button, do you proceed with selecting the
Connect button?
If this is the case, could you please try closing the RDP properties window after clicking "Save" instead of connecting to a remote Host? Then try selecting the
OK button in the RU's own connection properties window - this should save the properties correctly. Please see the screenshot below:

Please let me know if this worked for you.