When form is submitted, blank page is displayed instead of thank you message.

Hello,

I got the following message from one of my participants despite the fact I clearly set the classic thank you page with the green logo.

What should I do?

Many thanks for your answer,

Marc 

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"When one submits, the thankyou page is blank (Chrome Version 64.0.3282.186 (Official Build) (64-bit) on Apple MacBook Air)--see attached."

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I'm sorry for the trouble caused to you. 

I did test your form and I am not able to replicate the issue you are having. I sent a test submission and the thank you message was displayed successfully. Please check the screenshot below:

I have cleared your form cache from here. I would suggest you to please test your form again and get back to us if the issue persists.

We will wait for your response.