Running Confluence Data Center v7.13.2 (and some plugins, so who knows if they have anything to do with this)
Created a Code block macro and left the default settings.
Inside the macro body I put:
c:
When I preview or update and view the page, the code block is blank but has a border, so I can tell where it is.
When I edit the macro's settings and refresh to Preview, it flashes c:, then disappears.
I have another Code block macro on the page with more code in it, and it appears fine.
I tried using the No format macro, but for some odd reason, the panel is not appearing, even when the No panel checkbox is unchecked (and when it's checked).
Something screwy is going on, anybody know why?