We are finding on Server 2012 that using GPP Drive mappings cause eventid: 1112:
"Group Policy Drive Maps was unable to apply one or more settings because the changes must be processed before system startup or user logon."
"Always wait for network at computer startup and logon" has been enabled but event warning still remains.
The drives appear to get mapped correctly but we just don't seem to be able to get rid of this warning event.
Rgds,
Nick