I’ve found out that the activity search tool has a pretty serious bug. If you’re using Internet Explorer 6 and click on a marker then the whole map turns yellow. This only seems to be a problem in Internet Explorer 6, so if you have a newer version or use a different browser (Firefox, Google Chrome, Safari, etc.) then you should be fine.
I’m working with our developers to figure out what’s causing this problem and how we could solve it. I’ll send out an update once I know how long it will take to get it back up and running.