Problem with permissions

Whenever we try and checkout as a guest we get the following message posted on screen

“You do not have sufficient permissions to access this page.”

The System Information is as follows:

### Theme ###

Name: Twenty Fourteen
Version: 1.5
Author URL: https://www.ads-software.com/
Child Theme: ? – If you’re modifying Jigoshop or a parent theme you didn’t build personally we recommend using a child theme. See: How to create a child theme
Jigoshop Support:

### Templates ###

Overrides: twentyfourteen/index.php

Many Thanks

Stephen Firth

https://www.ads-software.com/plugins/jigoshop/