Some countries don't load subchildren
I'm trying to open the trees for France, UK and USA but I only get the turning thingy but it doesn't load. I've also tried to select different dates for the OSM database but with the same result. Other countries work though.
Great news. Hopefully it's fixed and not random. Please inform us if it should happen again since we are not certain that it's actually fixed.
We have another site with a similar issue that could very well be the same. While we are investigating that, and also waiting for response from the other user with issues, we'll keep this bug report open (under review).