Initialize-AXModelStore Needed for CU8
http://technet.microsoft.com/en-us/library/jj720267.aspx TN this helped me a lot
but the above link only shows to Initialize-AXModelStore for default AOS and DB,
For specific AOS and DB
Example will be:
Initialize-AXModelStore -Server DAXVMSERVER1 -Database MicrosoftDynamicsAX_model