I'm constantly appearing to some players even though I'm vanished. This is happening on all my servers that use vanish no packet. I've found no pattern to this behaviour.

I'm having precisely the same issues. There is absolutely no explanation or pattern that I can see - we've tried toggling different plugins, changing certain config settings, and there doesn't seem to be any rhyme or reason as to why it's randomly deciding to unvanish us. Incredibly unhelpful when we're trying to track griefers. :(

I have a mini game with it's own vanish code. It had similar issues when teleporting between worlds, when it didn't have the same issue on 1.6. I fixed it by adding some vanish code when the player teleports between worlds. The 1.7 vanish api seems to be more prone to this sort of thing.

@stevenpcc That's good to have reported. If you can get me more specific information on this issue I can work on a fix in CraftBukkit itself.

Did some testing with players. Some can see me, others can't. They were all logged in before me.

I can't really give you more than I have. My efforts to reproduce it on purpose have failed so far. It just happens sometimes, and I only know because the players speak to me or start hitting at me. I can confirm it does happen on login. I've logged into my survival server beside a player and it happened. VanishNoPacket vanished me, but he could still see me.

I can't be sure if I'm visible to all players or just a few of them. I can't be sure if it happens on teleports, as I may already be visible to them from logging in (although this did happen with my mini game code).

I've not been able to find a way to reliably reproduce it, but it seems to be happening in every server that uses vanish. LibsHungerGames plugin is affected too. Spectators sometimes are visible.

We are still seeing issues with this, has there been any progress?
I see there was an update released, but we are still seeing inconsistent issues with our admins seeming to join vanished fine, but then being able to be seen some minutes later.

I'm assuming there is no kind of hack out there that's allowing these people to see us?

We never saw this issue before 1.7 update, and trusted VNP 100% before now.

@MrDarn What version of 1.7 are you on? I'm interested in reproducible steps for 1.7.8 or later.

1.7.2, as we have not needed to update since then, as the updates have not impacted our server or custom builds.

Are we saying 1.7.8 has something that fixes this?

@MrDarn Yes, I'm hoping 1.7.8 and above should resolve the issues.