Logged as Bug #41 in our bug list. Not only the thumbnails, but in fact the old system of LIST/GALLERY/MAP that we used to have.
Note that although not displayed this is available to you on the new site. Click on the Map Button. This opens what we were used to seeing on the old ZA site. (how users are supposed to figure this out I dont know, and why it is so obtusely hidden is a bafflement). That LIST (first tab) view of that (which is now a simple filter with user = you) is infinitely more useful. We have asked for it to replace the current view of observations.
Another related issue, is in Gallery View. If you click on the thumbnail you get an intermediate window to waste your time and band width and make you wait. Get rid of all the intermediate windows (like we did on the old ZA site) and open them directly: that is what the users want! (what on earth is the purpose of the intermediate window???? for heavens sake!)