Apparently, wxConfigBase::Write() does not update values for next access on all platforms unless Flush() method is called. Added many calls to wxConfigBase::Flush() to make sure the Rad() calls get the right values.

src/widgets/Meter.cpp

@@ -1215,7 +1215,7 @@ void Meter::OnDisableMeter(wxCommandEvent &evt)
       {
       gPrefs->Write(wxT("/Meter/MeterOutputDisabled"), mMeterDisabled);
       }
-
+   gPrefs->Flush();
 }
 
 void Meter::OnHorizontal(wxCommandEvent &evt)
@@ -1309,21 +1309,8 @@ void Meter::OnPreferences(wxCommandEvent &evt)
    if (d.ShowModal() == wxID_OK) {
       mMeterRefreshRate = d.GetValue();
       gPrefs->Write(wxT("/Meter/MeterRefreshRate"), mMeterRefreshRate);
+      gPrefs->Flush();
    }
    
    mTimer.Start(1000 / mMeterRefreshRate);
 }
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