Caused by my commit f29c0b2b
"boost::shared_ptr->std::shared_ptr in slideshow"

where I foolishly converted
   shared_from_this()
to
   std::shared_ptr<Activity>((Activity*)this) )
all over the place, which is bad, I should have used
   std::dynamic_pointer_cast<ViewEventHandler>(shared_from_this())

Ah, the joys of C++ memory management.

Change-Id: I9b538e78730c9107870f406cb8ba482d491dd568