Pycharm & dataspell fail to run code

I'm running application code using the juypter notebook either from pycharm or dataspell.  I can step into the code with the debugger, which is great.  However, if I change the code & then run again, the changes don't always execute.

Is there some magic that I need to invoke to tell the notebook executor to pick up the changes (I hope)?   

FWIW, I'm using mac M3 Max, with Sonoma 14.3.1.   It has been known, in my brief acquaintance, to misbehave on at least one thing I would expect to work, so maybe it's a chip set problem.

Thanks, Beth