A few days ago I was using iJournal to update my journal, and for some reason (I was quite tired at the time), I thought that shift-command-L was the key-combo to make a link. Suddenly the login dialog popped up, and I discovered there is no way out of that situation. You have two choices: "Login" or "Quit". "Quit" does the obvious. "Login" performs a re-login and clears the window. Either way, that long entry you've been working on is gone gone gone.
So, just a minor suggestion: Add a "cancel" button to that dialog? Or don't clear the window after a login, perhaps. Actually, a combination of the two might work nicely; if you are not logged in at all (perhaps using iJournal offline), the "Submit" button in the lower right of the main window reads "Log In". The user logs in, the main text box is not cleared, they submit, quit, and get offline.
OK, this idea needs a little work. For instance, without the initial login, the three pulldowns on the main window can't get populated. I don't know enough of how the whole system works to suggest a solution for that. Hmmmmm... Here's one thought: In offline mode, turn them into combo boxes (like the "Mood" menu), and the user types in the Security level, pic-name, and journal name, and on log-in is prompted in the event of an error?
Just some thoughts. Love iJournal otherwise, hope to see it keep getting better!