I was not completely convinced by Firefly but I wanted to give it a chance. I just tried the Disaster at Firefly Station example and it crashes 5 times in few minutes.
Where can I check the version of Firefly installed? It seems to be version 2.0 but I am not sure.
I cannot say more about the bug at the moment: just that it crashes 4 times by loading resources and once in middle of the game.
Perhaps with Debug extension from Phi I can give you more infos.
Is it a known issue?