If anyone actually looks at my site, they will have spotted that the galleries on 3 pages looked pretty bad there for a few weeks. I use the Responsive Child Theme from CyberChimps, and the latest update to 18.104.22.168 of the free version did some serious damage to the way galleries work in WordPress. I am not the only user suffering from this, see http://cyberchimps.com/forum-topic/media-gallery-issues-after-update/.
I have reverted back to version 22.214.171.124 which has fixed the problem, but it still doesn’t play that nicely with WordPress – I can’t see some of the better gallery options available in the latest versions of WordPress. May need to look at a new theme!
Just tried 126.96.36.199 (28/02/2014) which is the latest update, and it has the same problem. Looks like CyberChimps have not even acknowledged it’s a bug – definitely time to look for a better theme. Maybe the Word Press 2014 theme, it’s responsive and probably works with wordpress quite well!