Are you using some custom plugins? Directcanvas sometimes doesn't like them.
Yeah, I am. Thanks for letting me know. I'll remove them and let you know if it's works
EDIT: OMG! Thanks, it's working now!
While I'm here, I have another question:
1. If my main aim is to develop the game for iPhone/Android devices, Is it bad to use big sprites? (I created big sprites so that it looks good on retina display iPad's too) Will it reduce my performance?
2. My tiled - background image turned into a white image. I know that appMobi is in beta. But to those who've created their games using appMobi, is there a way to get around this?
3. What are some fundamental suggestions to make a game that runs smoothly on mobile devices?