We have been upgrading Moodle since V3.0.0 on this installation and have had an issue with the Boost theme not working on the Select Boxes.
On the Grader Report the drop down to change to say single view, grader report, scales view, etc does nothing. If we change the theme (?theme= in URL) it works fine. I suspect something odd with Boost?
This issue is also on Groups in Course Completion.. Selecting an option does nothing...