diff --git a/cwPresetSel.cpp b/cwPresetSel.cpp
index 7c468c5..7335b9a 100644
--- a/cwPresetSel.cpp
+++ b/cwPresetSel.cpp
@@ -910,8 +910,12 @@ bool cw::preset_sel::track_loc( handle_t h, unsigned loc, const cw::preset_sel::
   // if 'f' is valid but different from 'last_ts_frag'
   if( f != nullptr && f != p->last_ts_frag )
   {
-    p->last_ts_frag = f;
-    frag_changed_fl = true;
+    // don't allow the selected fragment to go backwards
+    if( p->last_ts_frag == nullptr || (p->last_ts_frag != nullptr && p->last_ts_frag->endLoc < f->endLoc) )
+    {    
+      p->last_ts_frag = f;
+      frag_changed_fl = true;
+    }
   }
 
   frag_Ref = p->last_ts_frag;
diff --git a/cwPresetSel.h b/cwPresetSel.h
index e99f0cb..e16d791 100644
--- a/cwPresetSel.h
+++ b/cwPresetSel.h
@@ -115,6 +115,7 @@ namespace cw
     void track_timestamp_reset( handle_t h );
     bool track_timestamp( handle_t h, const time::spec_t& ts, const cw::preset_sel::frag_t*& frag_Ref );
 
+    // Same as track_timestamp_???() but tracks the score 'loc' instead of timestamp.
     void track_loc_reset( handle_t h );
     bool track_loc( handle_t h, unsigned loc, const cw::preset_sel::frag_t*& frag_Ref );