ODBC Administrator won't let me change custom parameters

I'm having a hard time setting up a DSN in the ODBC Administrator. I've got my driver all set up, and then I switch over to the System DSN tab to create the DSN. I click "Add..." and the "Choose a Driver" pane drops down. I choose my driver, and get the DSN definition panel. So far, it's fine. I can type in the DSN and description. Still fine. Then I go to add the keyword/value pairs I need to specify the specifics of the DSN, and I can't! Well, to be specific, I can add them, but then I can't modify them in any way. The help for ODBC Administrator says to double click on the keyword or value to change them, but when I double click on them nothing happens.

Has anybody encountered this? Is there a workaround? I've got to get ODBC working!

Thanks