Pasting URLs causes answers to silently fail to post.

[Michael Kuhl _Appfire_]

Hello All - When answering questions where the answer includes a URL (wether as linked text or simply pasting the URL) the answer either silently fails to post or I get a message that I have invalid html.  In all cases I'm copying and pasting directly from the address bar of another tab and hav verified that the links are valid.  When editing an answer and adding a link the existing answer disappears.

This happens in Safari (no extensions), Chrome, and FireFox (no extensions) on Mac OS Mojave.  The only thing in common is I am authenticating with Google.

Is anyone else seeing this?  Any suggestions for resolving it?