Some users have been experiencing issues when trying to view data via the open data portal. In some cases, when using Internet Explorer Canterbury Maps will come back with the following error "An error occurred fetching map data" along with a grayed out map.
To fix this issue, follow the below steps:
1. Go to the internet settings (by clicking the cog wheel in the top right) and select 'internet options'
2. Click on the 'advanced' tab
3. Make sure 'enhanced protection mode' is turned off
4. For the changes to come into effect please clear your browser cache