Yesterday we had trouble locking the SHG after the beckhoff restart.  The scan range for the PZT was restored correctly after the restart to 45-100V, but it seems to no longer be the right range to find a resonance.  This morning I changed the range to 0-100V, this allowed us to lock with the PZT voltage around 50.  I've now set it to 20-100V and accepted this in SDF.