what I have found with playing with this combo lately is if you fire up  DCS first, let it autoconnect to the servers SRS when you join the  multiplayer server, then open virtual cockpit after you select your  aircraft, it work fine for that session.  Then the next time you use  DCS, the DCS SRS plugin never connect to the SRS application.  The only  fix I have found so far is uninstalling SRS, removing the following  directory left over "C:\Program Files\DCS-SimpleRadio-Standalone".  Then  reinstall SRS, and relaunch how I first describe how I get it to work.   I'm assuming virtual cockpit when it injects is messing up the SRS  scripts