We have recently updated to MOODLE 2.7 and I am seeing a small issue. From time to time I am finding some buttons are not functional in MOODLE when I am using Firefox on my office Mac running Yosemite. For example the 'Get these logs' button. Also recently I have been receiving support calls where students have taken a quiz and claimed they submit it but MOODLE is not seeing a submission. And so far one of the students having this issue is a Yosemite user.
Starting to research the issue now, but I wanted to see if anyone else has had the same issue.