Do you mean that you tried disabling HW decoding in the connection menu and you still got the green screen?
Indeed
The menu enables/disables for the session, but does not stop the libraries from being loaded.
Hm, but after changing this parameter there is a message about required restart of the server appears. And I suppose that restarting the server should reload all required libraries and should not load those libraries which is not required anymore. Is it wrong?