Lightningheart never got back to us, neither on here nor via email. It's possible that updating or restarting his/her computer cleared up the issue in that particular case. Feel free to contact us at
support@splasm.com any time an issue is frustrating you and you can't find the answer here on the forums.
Since you are fully updated and restarting didn't get you going again, we will need to delve deeper. It's possible that just CheckBook Pro's Preferences aren't getting saved properly. Would it be possible for you to send us your Preferences file so that we can take a look at it?
To locate the file (which is tucked away in the hidden User Library folder if you're using Lion), first, click on Finder down in the Dock. Then, hold down Shift and Command with one hand and press the letter G key with the other hand. Next, paste the following in to the 'Go to Folder' field:
~/Library/Application Support/Splasm Software, Inc./CheckBook 2
Attach the 'CheckBook 2 Preferences' file, from the CheckBook 2 folder you end up at, to an email to us at
support@splasm.com.
Thanks for helping us gather more information. Once we see the Preferences file, we should be able to figure out why CheckBook Pro is not performing as expected to there.