WP-Discourse - one entry not working and no start conversation link

For some unknown reason one of my blog posts will not accept comments, all the rest do, new or old ones can be edited to work.

And I cannot see the start discussion link when there are no comments, yet if I add a comment into discourse blog will show this up.

Also the link back to show full post doesnt load.

Very frustrating

I think in fact the issue was that it would only support new entries and so I recreated my blog posts and this seems to have sorted out the link to start a discussion and I edited URL of the one post that refused to connect at that is now working as well. Strange but true.