Thanks! I took a look and I found the problem. In your “Welcome” routine, code component “code_2”, tab “Before Experiment”, there is this bit of JS:
window.addEventListener("keydown", onkeydown);
function onkeydown(keydownEvent) {
keydownEvent.preventDefault();
}
That prevents the default handling of keydown events (which includes typing in text in the expinfo box). By disabling this code, I could type something in for participant. If the code is required for your experiment, perhaps moving it to the “Begin Experiment” tab would work as well?