Crash on Ace of Penguins

Hi,

I found out that the game Merlin from Ace of Penguins crashes on start. 
I managed to isolate the issue to a XGetImage call on startup.

I think this is because of a race condition, since adding a sleep(1) 
just before the XGetImage removes the crash, at the cost of waiting an 
extra second on startup.

I don't know much about X11. Is there a way to wait until XGetImage has 
available whatever it is that it needs?

Thanks.