I upgraded to OS X 10.9, now iBank 4 won’t open. How do I fix this?

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.