Contactform 7 does not show up on page

Hi there,
I’ve been searching and experimenting half the morning now, but I must miss something obvious….
I installed and activated contactform 7 and really simple captcha.
I inserted the code [contact-form 1 "Contactformulier 1"] on my page and saved. Now: the inserted code shows, not the form.

What am I missing?

Any help is appreciated…

OMG!
Now I see that not any shortcode is displayed, the nextgen images do also not show up….

Regards!