Hi,
New tiles from tile.opentopomap.org will not load. I suspect this is because Topofusion does an HTTP GET and the server is redirecting to HTTPS. Wireshark TCP stream trace follows.
Chris
GET /15/16178/12727.png HTTP/1.1
User-Agent: TopoFusion Pro/5.320
Host: tile.opentopomap.org
Connection: Close
HTTP/1.1 301 Moved Permanently
Date: Thu, 22 Dec 2016 19:52:26 GMT
Server: Apache/2.4.18 (Ubuntu)
Location: https://tile.opentopomap.org/15/16178/12727.png
Content-Length: 341
Connection: close
Content-Type: text/html; charset=iso-8859-1
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>
<p>The document has moved
here.</p>
<address>Apache/2.4.18 (Ubuntu) Server at tile.opentopomap.org Port 80</address>
</body></html>