Pressing F3 (FindNext) does nothing. Find next works only from the main menu Edit dropdown.
The find dialog box find button is labeled "Find Next", rather than "Find". This is a bit confusing. The search process would go more smoothly if F3 could be pressed while the Find dialog box is open. If this is not a good way to handle the matter, having two separate buttons in the dialog window for Find and FindNext would make searching work more smoothly.