We have been investigating this issue and so far have found the following issue:
Our first steps window uses the WPF WebBrowser control and disabling it will make the warnings disappear.
The workaround currently, for Enscape is
Open:
%userprofile%\AppData\Local\Enscape\Enscape.config
Set
<ShowFirstStepsWindow>true</ShowFirstStepsWindow>
To
<ShowFirstStepsWindow>false</ShowFirstStepsWindow>
But, I don’t understand why this is even an issue. Any other plugin can be using the WPF WebBrowser control and I don’t really see where the conflict arises. Reach out to me so we can resolve this issue.