• Permit Event Enrollment must be enabled in module settings
• Allow Enrollment must be enabled on the event
• Enroll List on Detail View must be enabled on the event
• There must be people enrolled to the event
• Select the User Fields to Display must be configured appropriately in module settings

I'm assuming everything is correct for you since this is an upgrade, but could you detail your configuration. Then we can see if it is some sort of upgrade problem.

To un-enroll from events, the user must go to the MY Enrollments view, where they can delete their enrollment as long as it is outside a specific period of time as defined by the administrator.

Also, I noticed you posted a bug yesterday, but it got deleted by a moderator (no idea why, probably a wrong key click). I have posted a bug fix, which will be in the next release. I didn't see it as a showstopper, since it only occurs if someone clicks again when there is a partial postback going on as indicated by the progress bar that displays as the bottom of the page.

Cheers
Roger

/* Change NoEnrolees null value to 1 */

UPDATE {databaseOwner}{objectQualifier}EventsSignups

SET NoEnrolees = 1

WHERE NoEnrolees is NULL

GO

/* Change NoEnrolees to NOT NULL */

ALTER TABLE {databaseOwner}{objectQualifier}EventsSignups ALTER COLUMN NoEnrolees Int NOT NULL

GO

The way the No of Enrolees works is that it will allow upto the module maximum provided there are enough spaces left for the event. Please apply the SQL fix above to see if the module then behaves correctly. One of the things I have done with your own bug, was to improve the coding around the display of existing enrollments.

Ernst Peter and I will have to discuss if we do another release, if so it will be a 5.1.2 since there is a SQL change, and the other bug fix will be included.

Cheers
Roger