This ticket is to fix some issues with funnel plots. A joint issue is open at lbl-srg/funnel#88

The most important issue appears when plotting the new trajectories of a unit test. In this case, the execution may be stuck at

Server will run for 10 s (or until KeyboardInterrupt) at:
http://localhost:34579/funnel

and pressing Ctrl+C has no effect.

Another issue appears when opening a plot or the summary table in the browser. The browser may try to load the page indefinitely and the page must be reloaded for its content to be displayed.

These issues seem to be system and platform dependent.