[cc65] Debugging stack overwrite problem

I wrote a small pong game for the Lynx using collision detection and 
some new features of the tgi driver.

But then I decided to add scores to the display.

main() {
   signed Score;

   Score++;
   itoa(Score, buffer, 10);
   tgi_outtextxy(10, 10, buffer);

}

If the Score is defined inside the main routine it increments by one, 
gets displayed but is the zeroed before the next round.

If I place it outside the main routine it works ok.

signed Score = 0;

main() {
}

I can also remove my own code and then it works even inside the main 
routine.

Obviously I have some routine that is overwriting the stack. Are there 
any tools to find what it could be?

--
Karri

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