Still having this issue the emulator will open and then close when loading a game. If it is set to windowed in redream and not full screen it will work. Narrowed this down to Launchbox/BigBox because the emulator will load it every time when not using the front end. Also there is an error in the log file that redream creates:
[ERROR] MEM [/builds/inolen/redream-private/src/guest/memory.c:698] Check failed: res != (void *)-1