I just stumbled across this bug, which makes the runner freeze. If the player tries to pick up the dynamic object the player is standing, sitting or lying on, the runner freezes. I attach a demo with a simple fix: The task "get something when on it" fixes the problem. If you delete this task you can make the runner freeze by typing "stand on table" followed by "get table".
I have made a bug report here: http://www.adrift.co/bug/19172
Please up-vote it.
There are now quite a few bugs in the standard library which can be solved. Perhaps it would be a good idea to put a list of known issues and solutions in one place?