Hi,
Sorry to report this but still having problems with save & publish.
I've installed completely fresh version and new database on local machine.
When I change any content I can save, but then when I click save & publish I get the red box error at the bottom that says "Error publishing content".
Also if I make changes and don't click save first but go straight for save & publish I get the same error.
I then tried to create a complete new page and get the same result so can't add any content.
I ran db/build?flush=1 to clear eveything down but got the same.
Let me know if there is any further information I can provide to track this down.
Regards
Trevor