I am not a DB pro, so please excuse me, but isn't MyISAM kind of the "old school" tech and not recommended now-a-days (especially for different types of snapshot backups).
I use amazon RDS for my sql server and its telling me:
This DB Instance also contains MyISAM tables that have not been migrated to InnoDB. These tables can impact your ability to perform point-in-time restores. Consider converting these tables to InnoDB. Please refer to http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Appendix.MySQL.CommonDBATasks.html#MySQL.CommonDBATasks.Tables
Any reason I can't force this table over to innodb?