AVR-Chat

IM using the ICC compiler trying to getstarted with a program
The program seems to get stuck in a loop when it reaches the end of 
the first function called
It steps through on the simulator goes to the start of the main() 
function in to the first function but at the end of that function 
seems to reset and instead of carrying on to the next instruction in 
the cycle goes back to the satrt of the main function again

any ideas?
watch dog??
thanks for any help