I recently was having issues using the core Image Slider block. Nothing major but it had to do with wth Slide Transition Speed & Maximum Slide Width. After looking at the form_setup_html.php, I found a mistake on line 306. The form input field is setting the "speed" value in the database but it should be "maxWidth".

I'm just going to override this for my application but it would be nice if these was addressed in the core.