I can't replicate any of that. Jetway on L2 opens doors L2, L1 stays closed. Catering works correctly.
Have you maybe downloaded or edited the airplane profile ? Maybe you downloaded a profile made by somebody before GSX supported the 777-200 officially ? Check the airplane configuration page: if it says it's using something from %APPDATA%, it means you are not using the profile the airplane is supplied with or the internal GSX profile.
Hit the RESET button and it should revert "developer-provided" data.
Of course, I assume GSX is full updated, if you are not sure, run another update Check now.