Not able to create Virtual Machine - Gallery is empty

Hi,

Earlier today I was able to create VMs using the gallery.
I have deleted my previous VMs and created a Affinity Group, Virtual Network and Storage Account.

But now I am not able to create VMs anymore.

The gallery of available VMs doesn't show any available VMs anymore.
And I am neither able to create a VM using the Quick Create option (the wizard doesn't continue after clicking "Create a virtual machine").

I hope somebody can help.

Regards, Jeroen