diff --git a/src/PluginManager.cpp b/src/PluginManager.cpp
index 6fe098c33..f1a17a9a0 100644
--- a/src/PluginManager.cpp
+++ b/src/PluginManager.cpp
@@ -965,9 +965,12 @@ void PluginRegistrationDialog::OnOK(wxCommandEvent & WXUNUSED(evt))
 
    wxString msg;
    msg.Printf(_("Enabling effects:\n\n%s"), last3.c_str());
-   
-   ProgressDialog progress(GetTitle(), msg, pdlgHideStopButton);
-   progress.CenterOnParent();
+
+   // Make sure the progress dialog is deleted before we call EndModal() or
+   // we will leave the project window in an unusable state on OSX.
+   // See bug #1192.
+   ProgressDialog *progress = new ProgressDialog(GetTitle(), msg, pdlgHideStopButton);
+   progress->CenterOnParent();
 
    int i = 0;
    for (ItemDataMap::iterator iter = mItems.begin(); iter != mItems.end(); ++iter)
@@ -978,7 +981,7 @@ void PluginRegistrationDialog::OnOK(wxCommandEvent & WXUNUSED(evt))
       if (item.state == STATE_Enabled && item.plugs[0]->GetPluginType() == PluginTypeStub)
       {
          last3 = last3.AfterFirst(wxT('\n')) + item.path + wxT("\n");
-         int status = progress.Update(++i, enableCount, wxString::Format(_("Enabling effect:\n\n%s"), last3.c_str()));
+         int status = progress->Update(++i, enableCount, wxString::Format(_("Enabling effect:\n\n%s"), last3.c_str()));
          if (!status)
          {
             break;
@@ -1016,6 +1019,8 @@ void PluginRegistrationDialog::OnOK(wxCommandEvent & WXUNUSED(evt))
 
    pm.Save();
 
+   delete progress;
+
    EndModal(wxID_OK);
 }