i'll try to look into this next week sometime

Thank you Will :)

Hi there,

Just got around to testing this. I can't reproduce. (I'm on ubuntu). When I try for instance on binder, it's fine. (This link )

Can you provide precise steps to reproduce?

Thank you.

hey will :) I just gave it a shot on binder as well. First it seemed that the problem did indeed show but it turned out that I had to wait a couple of seconds after creating the solution button:

so at least I am not crazy :D I think I didnt wait the last time i tried it on binder ... I'll check with my collegues working on windows if that is their problem as well (but somehow I don't think so). Will let you know asap. Thanks for checking though!

Aha yes, there's some lag as the code has to go through the backend of jupyter to write the file out. Locally, though, it should be fairly quick. But let me see if I can repro that raciness locally, maybe there's a fix for that.

Separately, I'm going to try to get a new release out for you that will allow for alternative kernels.

OK I tried to replicate the problem locally, and can't. If there's a race condition, I can't beat it yet.

@4flixt I've release 1.0.1.19 which uses %%writefile to save Graffiti if the kernel is an unknown kernel. This means any (probably Python-based) kernel that supports this magic command will work now, so you can feel free to try your non python3 kernels and let me know if it works for you.