Upcoming Events Widget Not displaying

Hi,

Logged in as the site admin, I can see events in the upcoming events widget listing.
http://awesomescreenshot.com/0094zyvtb8

When logged out or logged in as a subscriber, I can not see the upcoming events.
http://www.awesomescreenshot.com/image/341241/d281f05202053a28ca2b601d9bca0c0d

Furthermore, and possibly related, the admin can see the event listing but no other user can: http://www.munterwestermann.com/rsrescuedev/classes/

Perhaps a conflict with Membership plugin?

I have tried changing theme to Twenty-Fifteen but no change.

Thanks in advance for your help. You already have access to the site.

Richard