I'm on CiviCRM 4.6.18 and Drupal. When I save a case type, I keep getting an error on the top right that says "API error: DB Error: already exists." I'm not sure if this is causing another issue I'm having which is when I create a case, the loading keeps hanging.
No, not normal. And not, AFAIK a known error. In order to make sense of something like this devs usually need debugging information. There is error output in the log files in the ConfigAndLog directory - on drupal sites this will usually be in sites/default/files/civicrm/ConfigAndLog
Not sure what was going on, but thank you to Eileen. I did the following steps on CiviCRM 4.7.18, probably not ideal if you already have data though.
- Delete all cases and case types.
- Delete all relationships
- Disable CiviCase
- Clear Cache
- Re-enable CiviCase