BR: Crash on rewind

[fromwithin]

I just held down rewind for half a second on my MIDI controller. When I let go of it, Tracktion disappeared. Here's the only useful thing in the log:

10 Sep 2016 19:55:53 Thread 0:
10 Sep 2016 19:55:53 0: selection/tracktion_SelectionManager.cpp:tracktion_engine::Selectable::notifyListenersOfDeletion:167
10 Sep 2016 19:55:53 1: model/edit/tracktion_Edit.cpp:tracktion_engine::Edit::~Edit:417
10 Sep 2016 19:55:53 2: model/export/tracktion_RenderManager.cpp:tracktion_engine::RenderManager::Job::handleMessage:118