diff --git a/src/effects/Effect.cpp b/src/effects/Effect.cpp
index 30b3cbe11..adbee9037 100644
--- a/src/effects/Effect.cpp
+++ b/src/effects/Effect.cpp
@@ -71,6 +71,9 @@ greater use in future.
 #include <unordered_map>
 #endif
 
+// Effect application counter
+int Effect::nEffectsDone=0;
+
 static const int kDummyID = 20000;
 static const int kSaveAsID = 20001;
 static const int kImportID = 20002;
@@ -2267,6 +2270,7 @@ void Effect::ReplaceProcessedTracks(const bool bGoodResult)
    // The output list is no longer needed
    mOutputTracks.reset();
    mOutputTracksType = Track::None;
+   nEffectsDone++;
 }
 
 void Effect::CountWaveTracks()
diff --git a/src/effects/Effect.h b/src/effects/Effect.h
index 31e0f405b..867828d99 100644
--- a/src/effects/Effect.h
+++ b/src/effects/Effect.h
@@ -340,7 +340,6 @@ protected:
    bool TrackGroupProgress(int whichGroup, double frac, const wxString & = wxEmptyString);
 
    int GetNumWaveTracks() { return mNumTracks; }
-
    int GetNumWaveGroups() { return mNumGroups; }
 
    // Calculates the start time and selection length in samples
@@ -369,6 +368,9 @@ protected:
    void CopyInputTracks(); // trackType = Track::Wave
    void CopyInputTracks(int trackType);
 
+   // A global counter of all the successful Effect invocations.
+   static int nEffectsDone;
+
    // For the use of analyzers, which don't need to make output wave tracks,
    // but may need to add label tracks.
    class AddedAnalysisTrack {
diff --git a/src/effects/nyquist/Nyquist.cpp b/src/effects/nyquist/Nyquist.cpp
index 4b56b5bee..58e1754a4 100644
--- a/src/effects/nyquist/Nyquist.cpp
+++ b/src/effects/nyquist/Nyquist.cpp
@@ -488,6 +488,8 @@ bool NyquistEffect::CheckWhetherSkipEffect()
 bool NyquistEffect::Process()
 {
    bool success = true;
+
+   int nEffectsSoFar = nEffectsDone;
    mProjectChanged = false;
    EffectManager & em = EffectManager::Get();
    em.SetSkipStateFlag(false);
@@ -790,7 +792,11 @@ _("Selection too long for Nyquist code.\nMaximum allowed selection is %ld sample
       dlog.ShowModal();
    }
 
-   ReplaceProcessedTracks(success);
+   // Has rug been pulled from under us by some effect done within Nyquist??
+   if( nEffectsSoFar == nEffectsDone )
+      ReplaceProcessedTracks(success);
+   else
+      ReplaceProcessedTracks(false); // Do not use the results.
 
    if (!mProjectChanged)
       em.SetSkipStateFlag(true);