I had the same problem. Take a look at your display settings. If you are set to Medium or Large it cuts off the information. You'll need to change to small, log-out and log back in, and then you'll see everything. At least, that is what resolved my problem. Filemaker (or ODBC, not sure which) doesn't take into account the different display settings.
You need to create a system DSN, not a user DSN
Just yesterday I could create a connection from Mac and Windows 64 to my mac mini server, inside and outside of our network.
Try the display settings mentioned above. Also you may find that you need to use user dsn vs system dsn. We had setup system dsn's and they failed, but user dsn's worked fine. I also always use the "connect to server" to get a list of available databases to confirm that I made the connection properly.
Thanks for your help. I am able to see complete window of Filemaker DSN configuration.