I've come across this bug where if you make all of the slides linking to something, the Orbit display collapses and basically hides the pictures behind the other content on the page. The Orbit UI elements still show up but all in a row.
If I have one slide with no link then it's fine.
On the Slide Options backend in WordPress I have selected Custom Size and have it registering that in functions.php
I think it has something to do with how if all of the slides have links their formatting is <img /> where as one without is <img/>.
If someone else has come across this and found a fix it'd be great to hear about it.