Savings Bond Tracker for Mac2.6.0

Would it be possible with the next update to have the program remember the window size upon exit? I have the window stretched out so I can view the columns I need to see, but the program doesn't remember this on separate launches.

I noticed that when I added bonds prior to May of 1992, it calculated the interest correctly up to a point. When I added a $1000 bond for May 1991, it shows interest of 644.80 when in fact it should show 622.40. Also - May 1993 - a $5000 bond comes up with an interest amount of 1,876.00 but it should be 1804.00. I am comparing the Savings Bond Tracker against two other programs - the first being the Bureau of Public Debt Calculator and the second - an Excel spreadsheet program that I've been using for years. They both come up with the bureau's calculation. Am I missing an update somewhere? I just purchased the program last night and I'm using version 2.1 for the MAC OS X. I'm running Tiger. Thanks, Lee Barry Sandler