aha, yes, i think you diagnosed it right. the indieweb plugin is actually just a bundle of the webmention and semantic linkbacks plugins, so you don’t need all three. maybe try deactivating the indieweb plugin and see if that helps. (and we obviously have more work to do to make this setup easier!)
Ah that is it! I got the Lifestream working too. Though I have disabled that for now because it shows all my activity (including activity in secret groups etc). So when I can control that more I’ll return to that one. I added IndieWeb I think from the “more building blocks” section and didn’t think about the cancelling out. Thank you for your help! :)