It looks like the When block issue is corrected. However, my students' projects are having tons of issues upon trying to continue to work on them today. Costumes are "empty" and not switching. Control blocks are working sporadically. Even work previously saved from last week is not showing up on the most recent versions.

The When block is not functioning. When dragged into the coding space, a "TypeError: Cannot read property 'scriptTarget' of undefined" message is given (see attached). The students working on their projects are having a hard time making progress without this function. Any thoughts?

Previously, I have had no problem opening up two instances of a game (in two browser windows), but the "Do you accept?" prompt does not appear in the opposing player's window anymore.