The navigation buttons finally appeared after some delay – possible server caching I don’t know. However I have over 1700 posts. The tabs appear and work up to 500 entries – is there a limit on entries? descending order post 499 has them forward and back, post 500 has them back and 501 has nothing. post 500 says “500 of 500 posts”
OK – so there is a 500 post limit for the array within the plugin to make the query cache friendly. Once that was altered it all seems to work fine.
So – I can’t say I’ve exhaustively tested but it seems to work with 6.9
Thanks for the feedback and for troubleshooting that @christina55c !
If I get some time, I’ll see if I can add an option in the admin for the plugin to set your own limit instead of hard coding it into the plugin.