Verify order page broken

Same here!
http://www.livingheat-vloerverwarming.nl/productoverzicht/checkout/

After the update the checkout page shows “Do not remove this image”.

wpec version: 3.8.14.1

It sounds like your store short codes may be damaged.
The following are the short codes that should be on each page.
The best way to do this is to change the post editor to text mode.

Product page = [productspage]
Checkout = [shoppingcart]
Transaction Results = [transactionresults]
Your Account = [userlog]

Regards
Edward

Thanx, that worked for me as well.
Problem solved..