Notice how some times it works. Now if I turn on debug I can see that my kernel sends the message on time (i.e. not on the second <enter>) and its the frontend who fails to print it. I wonder if anyone ever ran into something like this
I guess it is still a bug on my side because other frontends and kernels work fine.
oh crap I deleted the message before the gif: I have this wierd lag in my kernel where it delays the display of iopub stream messages
Also: it only happens on windows, on jupyter_console