If an entry's RDN contains a comma, an error is generated if the RDN is quoted instead of the comma being escape. Ex:
uid="test,123", ou=people, dc=example, dc=com - this generate an error
uid=test\,123, ou=people, dc=example, dc=com - this works
The error displayed is "Invalid RDN", and the ldap browser halts loading any more objects in that container.