MacJournal prompts me for a sync code every time I sync. Isn't it only supposed to prompt me once?
When you initially sync MacJournal data between a Mac and an iOS device, you will be presented with an 8-digit code on the device (in white text on a black background) that you need to enter into a dialog box on the Mac in order to "pair" the device and the Mac. You should only need to do this one time. After that, the devices should be properly paired, and you should no longer be prompted for the sync code.
If you are getting prompted for a sync code each time you sync, chances are that there was a problem saving the sync code to the keychain, and that you can resolve the issue by deleting the appropriate keychain item so that MacJournal can re-save it correctly.