A quick update. We've removed tapatalk entirely again which seems to have stopped the issues with new content and unsuccessful posts resulting duplicate posts (happened to me also over the weekend). Tech support have another ticket in with tapatalk and we are awaiting a reply. Support are also working on debugging the tapatalk plugin but this doesn't look all that hopeful. We're definitely not the only forum with serious tapatalk issues but we're continuing to work on it.
If you're noticing issues with the forum not related to tapatalk please let us know so we can work on these in the interim. Also, if you have the skills to help out, we'd love to hear from you.