Having VSS issues after creator's update as well w/ no entries in the event viewer. The HDM log does show:
SNAPSHOT0001 ERROR VssClient::ContinueBackupWithCreateSnapshot(). m_pVssObject->IsVolumeSupported( m_ProviderID, ) failed. hr = 0x80070057. E_INVALIDARG. One of the parameters is not valid.
SNAPSHOT0001 Leave CreateVSSSnapshotInt(). Snapshot creation failed. Fail details: CallingFunction = VssClient::ContinueBackupWithCreateSnapshot(); FailedFunction = m_pVssObject->IsVolumeSupported( m_ProviderID, ); ComMessage = E_INVALIDARG. One of the parameters is not valid.; hr = 0x80070057
SNAPSHOT0001 Leave CreateVSSSnapshot(). Snapshot creation failed. RC = 0x80070057
It is a GPT disk and it seem to have trouble processing the EFI System Partition; if I exclude said partition it seems to work.