Can anyone find the moon in the Strong Man screen?

I've played Madame Fate dozens of times, and I love the game, but I cannot find the 'crescent moon' on the strong man screen.

I have used all the hints, clicked over the entire area highlighted, and... nothing.

Is it a glitch? I can finish the game without it, but it's really annoying!

The hints tell me it's on the white curtain/screen on the stage, but I cannot see it or find it.

Anyone else had this problem?