Stuck at "We're getting ready to run your Python code now"

I’ve created a model using Python scripts ( and for behaviors).
When I reset the simulation, I get a “We’re getting ready to run your Python code now…” message with a loading circle icon above it and it’s stuck this way (30min and waiting). Reloading the page didn’t help.
I really don’t know how to debug this or what could be causing it. Any suggestions would be great!

Hi, tritium!

That’s an interesting issue I never encountered before. Could you check if clearing the browser cache is solving this issue? What browser are you using and is the issue persisting on a different browser?

I am experiencing the same issue. I’ve cleared my cache and have tried both Chrome and Safari.