[@netweb Keymaster 12 years, 1 month ago]

Try creating a new user, assign the participant role and test this yourself.

Does it work for you?

What about when you repeat those same steps with a moderator or keymaster role?

Have any of your other plugins or themes recently updated?

Have you tried to disabling all your plugins to see if the issue is resolved?

Have you tried switching the Twenty Fourteen theme to see if the issue persists?