There's an easy workaround for this problem.  It only happens when the main contact you start up with has a blank note.  To work around this problem:

    1.  Type something into the notes on the main contact you see when you start TntMPD. 
              It could be as simple as typing in a space or a single character.

    2.  Then save your change (File|Save).

(This issue will be fixed in TntMPD 2.1 r36 when it comes out.)