Links to external sites aren't opening those sites

[SDWriterClmt]

Maybe this is a silly question, but if I insert a hyperlink in a topic, once published as HTML5 shouldn't that link open a new browser window or tab at least, and load the linked site?

In our Help project I have hyperlinks in topics to various external sites, mostly Gov't sites. It's just been brought to my attention that these links don't work. Or at least don't work well. I can't recall for sure but I believe that they used to open okay. When using Edge it displays a message saying:

==========
This content can’t be shown in a frame
There is supposed to be some content here, but the publisher doesn’t allow it to be displayed in a frame. This is to help protect the security of any information you might enter into this site.
==========

Is there a way to get the links to work smoothly? I have explored the Target's Advanced options. The nearest thing I found to a related setting is the "Prevent external URLs from frames". But it isn't selected, and in any case I don't think it really has anything to do with this situation.

[SDWriterClmt]

Figured it out. I can manually add target="_blank" to the hyperlinks. I still feel like these links worked correctly at some point previous. Oh well.

<a href="http://www.hyperlinkcode.com/new-window.php" target="_blank">New Browser Window</a>