I see a + sign in front of the If. Do you have an elseif statement after the first if? If not, choose under Control the If statement without the + sign and try again.
Actually, it seems I'm limited in the number of 'items'. It I have 2 'elseif' statements and 3 'or' in the first if, then it does not save the event but does not display an error message.
With 2 'or' and 2 'elseif', it works. I have to delete one 'else if', in order to be able to use 3 'or'.