Rob, you have probably noticed that Google Maps behaves a bit differently than it used to do. I noticed this on some other websites over the recent weeks. However, it seems to have arrived on SMP today. It wasn’t behaving like this earlier this week.
Google have changed how the scrollwheel on the mouse works with their maps. For a long time, the default was that the mouse scroll wheel changed the zoom level. Now the default seems to be a message “use ctrl+scroll to zoom the map”. Only if you hold ctrl down at the same time does the zoom work. I’m a bear of very small brain and I’m used to just scolling so this change by Google bites me badly. I believe it’s possible, if you are using the right version of the Google API, that you can request the old way of scrolling, i.e. no ctrl needed.
Could you possibly have a look into making scroll work the way it used to when you get a free moment? Thanks.