Your version of iBank 4 currently installed is an older version of iBank 4 which is not compatible with OS X 10.9 Mavericks. In this case you should update to iBank 4.7.5. You can download and install iBank 4.7.5 using the following link: http://www.iggsoft.com/ibank/iBank4_Web.dmg
iBank 4.7.5 should work fine with OS X Mavericks.