On a recent build I found I was getting the below error "Product Key Not Found" when trying to run the Citrix Provisioning Services Device Optimizer.
After a look at procmon the solution:
Create a folder called “LocallyPersistedData” under c:\programData\Citrix\PVSAgent
Same solution to a different problem @ http://support.citrix.com/article/CTX134339
This was affected me in PVS 6.1HF19