You can run into the problem when you want to deploy a VM from a template the options are greyed out, even after
restarting the vCenter services. 

PowerCLI to the rescue:  

$templates = Get-Template *
    foreach($item in $templates){
        $template = $item.Name

            #Convert Template back to VM
            Set-Template $template -ToVM -RunAsync
            #Convert Template back to template :S
            $vmview = Get-VM $template | Get-View
            $vmview.MarkAsTemplate()

    }

Thnx to ictfreak