Everything stops working in ipython 3

[multigrid101]

I installed vimception as described in the readme. But once I start clicking into cells, the cursor just stays there and everything stops working. I can't type or anything. all I can do is leave insert mode and switch to other cells but then I can't edit those either.

edit: I can report some more details now:
Entering (ipython) insert mode i can actually type stuff, but there seems to be no way to switch between (vim) command and insert mode, only (ipython) command and insert mode.

If I execute code that results in an error message, like asdfasdfasdf, then everything stops working altogether.