That sounds like exception in event handler to me, seen those from various mods lately (since 1.8), usually NRE (NullReferenceException). I assume that such a thing stops the event-handler chain which has catastrophic consequences, one of them being "InputLock" not released, which leads to no control, keys and buttons not working etc. BTW: I built it against 1.9.1, but that should not be a problem. EDIT: Doing another experiment (Prograde Kuarqs in my Mun Station) ...you can see
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