The issue is now solved.
Sorry for this, we will investigate how we can avoid this in the future.

Sorry, but we are currently experiencing issues that are delaying updates in Merchant Hub. We have identified the issue and are deploying a fix for it right now.

This is how this affect you:

• New orders are delayed before they are show in merchant hub (they are registered but not shown)
• Changes (refunds/credits, activations, crediting fees) are delayed before they are shown

If you do any actions on an order they are all OK! 
Please do not perform order updates twice if you got a success message when you did it the first time.