When trying to add data to a map via MySQL, once you enter host, username, and password information, the interface will constantly try to connect to the database (the statusbar as well as the back, next and finish buttons at the bottom will continually flash), but never truly connect. It will show your databases, and after a few seconds (less than 30) it will stop trying to connect and look like it worked properly (I assume) but as soon as you attempt to choose a different database (I have a couple) it tells you , "No operations allowed after connection closed." at the top of the gui interface. If instead you simply try to click next you will be given the message, "Connection parameters are invalid."
I have not yet tried a database in MySQLServer5.0 (or 5.1) nor have I tried only having one database. Also I know the databases can be accessed because I am able to do so via JDBC using Eclipse.