I have the same problem: not possible to create new post, only post replies to existing threads (and I was about to create a new post in a small community, which Sync has helped me find now (and I didn't realizer existed in the Lemmiverse)
I realise this is beta, and otherwise everything works great
I don't have long term experience with either, but I started to selfhost both of them (anonaddy and simplelogin) about a month ago
I enjoy both, and both are running well at the moment - but there is no long term experience
I think , I would normally like Addy more (interface, capabilities, etc), however honestly it was the one, which caused me a lot more problems (mails getting lost unnoticed, without any notification, even multiple times - of course, in each case it was some config setting which I wasn't fully aware of, so kind of "user error). Simplelogin is running with less issues (as far as I can tell), and it's also a great piece of software: I can't even clearly explain why I use it less
Anyways, I'm very much interested in inputs on this topic, definitely look forward to discussion in this thread