When I did the last upgrade I was too lazy to go through classic/theme.css and make the few changes I needed to caption font size, so I used the old version that I had customized.
Now I have removed my customized version of theme.css and instead included the changes to the few styles in the header of the page showing the photo galleries. A better solution.
Thanks for pointing this out. I won't use the javascript to override the back button and will probably just keep with the Expand/Close button.