I am finding a few problems through out our site too with the upgrade.
Seems since upgrade our favourite little set of "Thumbnails" code is not playing nice and now act like Modal box's.
As in code is not contained with in the "Span" and Pictures are a mess. They are small and expand when you mouse over them.
As we are back into the swing of things for the students, I haven't got time to play around for a day and debug this.
So will just have to strip out this HTML code and use bootstrap grid as a quick way to fix it all.
Painful as got around 30 pages with these one throughout a course.
Edits: Changing <div class="thumbnail"> to <div class="well"> is a quick fix for anyone else that needs to do this.