Wanted to note that I am having same issues as the OP with the instrument readout saying "NEW TEXT". I also have the zoom map function working on Kerbin but not on The Mun or Minmus... haven't tried any other bodies. The log is throwing the exception below. (About 40 instances or so in the log.) Most likely the 40 occurances in the log are due to me clicking like a mad fool possessed during my testing ;-). At any rate... I have a new plain install of 1.7.3 KSP x64 with only ScanSat installed.
[LOG 21:45:07.187] [SCANsat] Height Map Of [Mun] Completed...
[EXC 21:45:12.413] NullReferenceException: Object reference not set to an instance of an object
SCANsat.SCAN_Data.SCANdata.ROCS (Boolean refresh)
SCANsat.SCAN_Unity.SCAN_UI_ZoomMap.get_ROCInfoList ()
SCANsat.Unity.Unity.SCAN_ZoomMap.SetIcons ()
SCANsat.Unity.Unity.SCAN_ZoomMap.setMap (ISCAN_ZoomMap map)
SCANsat.SCAN_Unity.SCAN_UI_ZoomMap.Open (Boolean v, Double lat, Double lon, SCANsat.SCAN_Map.SCANmap m)
SCANsat.SCAN_Unity.SCAN_UI_MainMap.OpenZoomMap ()
SCANsat.Unity.Unity.SCAN_MainMap.OpenZoomMap ()
UnityEngine.Events.InvokableCall.Invoke ()
UnityEngine.Events.UnityEvent.Invoke ()
UnityEngine.UI.Button.Press ()
UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData)
UnityEngine.EventSystems.ExecuteEvents.Execute (IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData)
UnityEngine.EventSystems.ExecuteEvents.Execute[IPointerClickHandler] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.EventFunction`1 functor)
UnityEngine.EventSystems.EventSystem:Update()