Thank you for your messages.
Could you please double check if the Host service startup mode
is set to Auto
If it's set to Auto, then please try solutions listed in this Knowledge Base article: https://www.remoteutilities.com/support/kb/host-service-won-t-start/
Also, I highly recommend that you add the Host installation folder to antivirus software exceptions list to avoid future problems in this regard.
In addition making any changes to the Host Settings via the Viewer makes no difference
Unfortunately, we couldn't reproduce this issue. The issue probably occurs because the Host service is not restarted after the changes to the Host settings are made. Please try solutions from the article above and see if it helps.
Please let me know if the problem persists.