"Help, I can't see my post!"
This is a major difficulty.
We experienced it during testing before the board went live, but it was intermittent. Now a lot of people are reporting that their posts/like/changes are invisible.
It's very likely indeed that whatever you posted/changed was actually posted or changed, the problem is that you are seeing an older (cached?) version of the page that was generated before the post/change: we dubbed this ghosting and it's highly annoying.
rev_dino has been informed, but for now the only solution seems to be either logging out, clearing cookies and logging back in or (more reasonably) hitting refresh multiple times until you see the change/post.
I'm sorry about this, but we had hoped that it would sort itself and it hasn't.
Added to known issues in post 1.