Thanks.
As Eszikind say, I found in the FDM.log this message: /vmfs/volumes/bc12754c-d04
ded91/SRVPROD-DC/SRVPROD-DC.vmx, vim.fault.NoCompatibleHost
Tomorrow I will do the first test, I think that it's the problem.
I found in the Vmware documentation the solution: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2036991
I have some machines with the ISO connect to a local Host datastore, I diconnected all CD-Roms of the VMs.
Tomorrow I will do the first test, I think that it's the problem.
Thanks.