I’m the developer who’s working on this.
Hopefully the problem with posts not being published to the forum has to do with them being published through blogging software. XML-RPC publishing was disabled in the plugin to fix this problem: Rogue time travel issue on Boing category posts.
There are a few ways to get around this. Check out this topic for details: https://meta.discourse.org/t/wp-discourse-plugin-tips-and-tricks/50757#wp-discourse-xmlrpc
I think the best method given there is to use a tag to indicate whether or not a post should be published.
The only other issue I’ve seen where some posts were not being published to Discourse was a conflict with a scheduling plugin. In that case the problem was solved by disabling the scheduling plugin (it wasn’t needed), but I think we can safely add a ‘force publish’ option to the plugin to deal with all cases except for posts that are published through XML-RPC.
