there is a regression going from 1.7.6.1 to 1.8.0 for any documentation line that starts with a link to an enumeration type.  See the following testcase:

/**
 * None
 * #test_enum_1 this does not link correctly
 *
 * this links correctly #test_enum_1
 *
 * @note
 * this links correctly #test_enum_1,
 * #test_enum_1 this does not link correctly
 * done
 */
struct test
{
public:
    /**
     * test enum
     */
    enum testEnum {
        /**
         * First test enum
         */
        test_enum_1
    };
};

No configuration changes necessary to reproduce the failure.