Rocket what? jk Never used it myself.
I was having issues in that the game would launch, but sometimes I'd get just a black screen. I'm not sure the light blue screen you're seeing. I would occasionally get the menu screen over the game, and the controls only worked the game. Not the menu.
Playing around this morning, here's what I've done to get it to work 100% of the time. Including the 7 enhanced games.
Config - Input - Player 1
Added to Button A, LeftCtrl
Click the down-arrow button left of the Game menu item
Set Start at Quick Menu: to On
Quit the emulator
In LaunchBox, set the Running Script to:
WinWaitActive, ahk_exe superzsnes.exe
Sleep, 3000
Send, {LControl}
$Esc::
{
Send !{F4}
ExitApp
}
Adjust the sleep timer up as necessary. Remove the Escape sequence if using that rocket app.