Hi,

I’m sorry to hear you got problems with executing cells. There are a couple of known causes to this. One could be a firewall blocking important dependencies for the Python runtime to work. If you look in your Network tab in Google Chrome, you can see if there are any network requests that are blocked. Would be great if you can post a screenshot of that here.

Another known issue is that if you open two tabs with Jupyter notebooks, they might have a little fight and end up crashing. This is a known bug in JupyterLite, which is the Jupyter environment we build upon. 

If you can provide screenshots of the developer console in Chrome, in addition to Network tab, then we can figure out what is going on.