Sim freezes when returning to main menu with inibuilds aircraft

Hi Guys Jagroad 1954 here.
My issue is cannot return to main menu after session, The esc command is not working was ok before,
I checked in controls type SK and u get the skip session and shows esc key as return button and space bar as backup not working i changed these to other keyboard commands and still dont work , So to play a mission u have to exit the whole game and come back in, All is ok if you have the back to command down left bottom corner within regulated missions and aircraft choice, its only at the end of the flight there is no back key. If anyone knows a command via the keyboatd please let me know,I will keep trying, Was working okay when first loaded in . I think there was an update and it changed this command. I tried reloading the sim . Still the same. HELP PLEASE ???