oo, that was to fast;)
Opening the webapp I got
“Oops, something went wrong 
You might have come across a bug in Prodigy’s web app – sorry about that. We’d love to fix this, so feel free to open an issue on the Prodigy Support Forum and include the steps that led to this message.”
and in the console
“Error: Minified React error #62”
What to do here?