I get the following error when trying to post by update beta16 problem:
/api/discussions:1 Failed to load resource: the server responded with a status of 400 ()
forum-0560dbcb.js:22 POST https://discuss.flarum.org/api/discussions 400
(anonymous) @ forum-0560dbcb.js:22
(anonymous) @ forum-0560dbcb.js:22
(anonymous) @ forum-0560dbcb.js:22
e.request @ forum-0560dbcb.js:1
e.save @ forum-0560dbcb.js:1
n.onsubmit @ forum-0560dbcb.js:45
(anonymous) @ forum-0560dbcb.js:454
t.<computed> @ forum-0560dbcb.js:1
t.<computed> @ forum-0560dbcb.js:1
n.onsubmit @ forum-0560dbcb.js:45
_.handleEvent @ forum-0560dbcb.js:22
EDIT Was able to publish the post after reloading the page: https://discuss.flarum.org/d/26461-no-access-to-admin-page-after-beta16-upgrade