Lock request conflicts with an established lock on Feature Service edit

[FraserHand]

Hi,
I'm running a feature service for editing and I'm hitting this error as I'm trying to do an update

05-23 16:36:54.689: W/ArcGIS(10547): com.esri.core.io.EsriServiceException: Unable to complete operation.
05-23 16:36:54.689: W/ArcGIS(10547): Lock request conflicts with an established lock [dbo.DEFAULT]
05-23 16:36:54.689: W/ArcGIS(10547):  at com.esri.core.internal.io.handler.c.a(Unknown Source)
05-23 16:36:54.689: W/ArcGIS(10547):  at com.esri.core.internal.io.handler.g.a(Unknown Source)
05-23 16:36:54.689: W/ArcGIS(10547):  at com.esri.core.internal.io.handler.g.a(Unknown Source)
05-23 16:36:54.689: W/ArcGIS(10547):  at com.esri.core.internal.tasks.a.e.a(Unknown Source)
05-23 16:36:54.689: W/ArcGIS(10547):  at com.esri.core.internal.tasks.a.e.b(Unknown Source)
05-23 16:36:54.689: W/ArcGIS(10547):  at com.esri.core.internal.tasks.b.call(Unknown Source)


has anyone come across this before?
It is a point FC on a non versioned feature class, ArcGIS server 10.1 SP1 feature service.
Thanks,
Fraser

[FraserHand]

Anyone? Anyone?

I'm seeing this in my AGS logs:

Version was edited elsewhere during edit session for GraphicFeatureServer.ApplyEdits. Will reconcile

...

Invalid Spatial Reference in the input for the operation on Layer: FFT. Using Map's Spatial Reference.
...


NZDF/C2.MapServer       


DEBUG May 27, 2013 5:08:43 PM Version Reconciliation Information. AcquireLock: false AbortIfConflicts: false ChildWins: true ColumnLevel: true Conflicts found: false NZDF/C2.MapServer       


DEBUG May 27, 2013 5:08:42 PM Using MultiuserEditSessionMode: esriMESMVersioned. NZDF/C2.MapServer       


DEBUG May 27, 2013 5:08:42 PM Operation parameter: rollbackOnFailure not honored due to data type in layer(s). NZDF/C2.MapServer       


DEBUG May 27, 2013 5:08:42 PM Begin GraphicFeatureServer.HandleREST_ApplyEditsOperation method. NZDF/C2.MapServer       


FINE May 27, 2013 5:08:42 PM REST request received