I just investigated a problem where a CRM user could not see the "New
The user had read/write permissions on the custom entity but it turns out they also need the "Append To" permission on the User entity as well:
Note About Security
- Append To allows another entity to be appended to this one (i.e. a Bank Account record to be appended to the User record in my example)
- Append allows this entity to be appended to another (the other must have the Append To security right!)