Using the new toolkit, if you add an image to a Create message, and then try and deploy it, you get the following message:
==OrganizationServiceFault Info=======================================================================================
Error : Message property name 'Target' is not valid on message Create.
Create images expect a MessagePropertyName = "id". Changing this manually in the crmregister file fixes the problem and allows the image to be registered.
Here's what the toolbox generates:
<Image EntityAlias="PostImage" Id="074f0466-8818-e711-80ea-005056933acd" MessagePropertyName="Target" ImageType="PostImage" />
and this is what it should be:
<Image EntityAlias="PostImage" Id="074f0466-8818-e711-80ea-005056933acd" MessagePropertyName="id" ImageType="PostImage" />
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