@ Axel
It seems the service (a free service provided to you by WordPress) that creates the thumbnails, it’s SSL cert is invalid so the images are being blocked by the browser. See for yourself, open the page in Chrome, hit the F12 key and then click the Console tab. Since this is an issue with the service provider, there not anything I can really do about and since this is free service, there is not even support that I can report the issue to.
I looked at some other commercial providers, it seems most do not to serve thumbs over SSL eother. At least one could, that would require redoing SiteShot to use that service and you would have register with that service and pay a monthly fee to them for providing you the service.
The only other options I can think of is not serving that one page over SSL on your site or manually creating your own thumbs.
As for the map extension, that is being worked on quite heavily every day. Here’s a forum thread that has a lot of the gory details :)
http://connections-pro.com/support/topic/map-view/#post-319925