atc options disappearing!

I am having this frustrating problem lately with the atc window. I recently started using atc with text log and auto open options disabled. Dont kno if this is the cause but since then during mid flight randomly the options disappear and may reappear sometime later. Minimizing or switching to windowed and back helped once. Last time I faced this nothing worked until atc timed me out and suddenly the options were back!please help.