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South migration error during installation

Using: OSX 10.8, Django 1.4.2, South 0.7.6 with MySQL (engine default is InnoDB).

Keep getting South migration error. I first ran manage.py syncdb (successfully) , but "python manage.py migrate askbot" raised the following error:

FATAL ERROR - The following SQL query failed: ALTER TABLE `askbot_thread` ADD CONSTRAINT `accepted_answer_id_refs_id_3a6a76b2d567ecbb` FOREIGN KEY (`accepted_answer_id`) REFERENCES `askbot_post` (`id`);
The error was: (1005, "Can't create table 'askbot.#sql-8c8b_1f' (errno: 121)")
 ! Error found during real run of migration! Aborting.

 ! Since you have a database that does not support running
 ! schema-altering statements in transactions, we have had 
 ! to leave it in an interim state between migrations.

! You *might* be able to recover with:   = CREATE TABLE `comment` (`comment` varchar(2048) NOT NULL, `offensive_flag_count` integer NOT NULL, `object_id` integer UNSIGNED NOT NULL, `content_type_id` integer NOT NULL, `user_id` integer NOT NULL, `score` integer NOT NULL, `html` varchar(2048) NOT NULL, `added_at` datetime NOT NULL, `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY); []
   = CREATE TABLE `answer` (`wiki` bool NOT NULL, `vote_up_count` integer NOT NULL, `text` longtext NULL, `offensive_flag_count` smallint NOT NULL, `summary` varchar(180) NOT NULL, `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `locked_at` datetime NULL, `author_id` integer NOT NULL, `question_id` integer NOT NULL, `comment_count` integer UNSIGNED NOT NULL, `score` integer NOT NULL, `vote_down_count` integer NOT NULL, `last_edited_by_id` integer NULL, `deleted` bool NOT NULL, `deleted_at` datetime NULL, `locked` bool NOT NULL, `is_anonymous` bool NOT NULL, `locked_by_id` integer NULL, `html` longtext NULL, `added_at` datetime NOT NULL, `deleted_by_id` integer NULL, `wikified_at` datetime NULL, `last_edited_at` datetime NULL); []
   = CREATE TABLE `question` (`wiki` bool NOT NULL, `vote_up_count` integer NOT NULL, `text` longtext NULL, `offensive_flag_count` smallint NOT NULL, `summary` varchar(180) NOT NULL, `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `locked_at` datetime NULL, `author_id` integer NOT NULL, `comment_count` integer UNSIGNED NOT NULL, `score` integer NOT NULL, `vote_down_count` integer NOT NULL, `last_edited_by_id` integer NULL, `deleted` bool NOT NULL, `deleted_at` datetime NULL, `locked` bool NOT NULL, `thread_id` integer NOT NULL UNIQUE, `is_anonymous` bool NOT NULL, `locked_by_id` integer NULL, `html` longtext NULL, `added_at` datetime NOT NULL, `deleted_by_id` integer NULL, `wikified_at` datetime NULL, `last_edited_at` datetime NULL); []
   = ALTER TABLE `askbot_thread` ADD COLUMN `accepted_answer_post_id` integer NULL; []
   - no dry run output for alter_column() due to dynamic DDL, sorry
   - no dry run output for delete_foreign_key() due to dynamic DDL, sorry
   = ALTER TABLE `askbot_thread` DROP COLUMN `accepted_answer_id` CASCADE; []

 ! The South developers regret this has happened, and would
 ! like to gently persuade you to consider a slightly
 ! easier-to-deal-with DBMS (one that supports DDL transactions)
 ! NOTE: The error which caused the migration to fail is further up.
Error in migration: askbot:0101_megadeath_of_q_a_c
Traceback (most recent call last):
  File "manage.py", line 11, in <module>
    execute_manager(settings)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/Django-1.4.3-py2.7.egg/django/core/management/__init__.py", line 459, in execute_manager
    utility.execute()
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/Django-1.4.3-py2.7.egg/django/core/management/__init__.py", line 382, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/Django-1.4.3-py2.7.egg/django/core/management/base.py", line 196, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/Django-1.4.3-py2.7.egg/django/core/management/base.py", line 232, in execute
    output = self.handle(*args, **options)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/South-0.7.6-py2.7.egg/south/management/commands/migrate.py", line 108, in handle
    ignore_ghosts = ignore_ghosts,
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/South-0.7.6-py2.7.egg/south/migration/__init__.py", line 213, in migrate_app
    success = migrator.migrate_many(target, workplan, database)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/South-0.7.6-py2.7.egg/south/migration/migrators.py", line 235, in migrate_many
    result = migrator.__class__.migrate_many(migrator, target, migrations, database)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/South-0.7.6-py2.7.egg/south/migration/migrators.py", line 310, in migrate_many
    result = self.migrate(migration, database)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/South-0.7.6-py2.7.egg/south/migration/migrators.py", line 133, in migrate
    result = self.run(migration)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/South-0.7.6-py2.7.egg/south/migration/migrators.py", line 107, in run
    return self.run_migration(migration)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/South-0.7.6-py2.7.egg/south/migration/migrators.py", line 82, in run_migration
    south.db.db.execute_deferred_sql()
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/South-0.7.6-py2.7.egg/south/db/generic.py", line 309, in execute_deferred_sql
    self.execute(sql)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/South-0.7.6-py2.7.egg/south/db/generic.py", line 273, in execute
    cursor.execute(sql, params)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/Django-1.4.3-py2.7.egg/django/db/backends/util.py", line 40, in execute
    return self.cursor.execute(sql, params)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/Django-1.4.3-py2.7.egg/django/db/backends/mysql/base.py", line 114, in execute
    return self.cursor.execute(query, args)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/MySQLdb/cursors.py", line 201, in execute
    self.errorhandler(self, exc, value)
  File "/Users/yuvalweinbaum/Envs/askbot/lib/python2.7/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
    raise errorclass, errorvalue
django.db.utils.DatabaseError: (1005, "Can't create table 'askbot.#sql-8c8b_1f' (errno: 121)")