Why can't I see players on the map?

I had set up a Minecraft 1.8.8 server and play together with a friend on this server. All clients and the server are Vanilla, no mods installed.
I had created Map#6 some time ago, and I copied it for my friend. It worked for some time that we both could see each other.
A few days ago, this feature broke. I can't see my friend on my map. But he can see me. The maps are identical, both Map#6.
How can I solve this?
Best Answer
you most likely cannot see players on the map because you aren't using a locator map. By default when you create a map it will no longer show your location or player locations. If you combine the map with a compass in the crafting table it will become a locator map and give these player locations.
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How do you get a map to show players in Minecraft?
Players will need to place a map and a compass inside the cartography table and it will create a locator map for the player. Players can find these blocks inside villages or they can craft them themselves using two paper and four wooden planks. Q.How do I see each other on map Valheim?
Note that you currently cannot see the markers of any other player if you're playing multiplayer on a Valheim server. However, you can tick the "Visible to other players" box in the bottom-right corner of the map screen, which will allow other players on the server to see your current location on their maps.How do I find people on the map in Red Dead Redemption?
Is the map placed on the map layer or the token layer? If you have it on the GM layer, it will be invisible to the players. If it is transparent to you that means it is on the GM layer. Player tokens must have sight and be assigned to one or more players.Liz Phair - Why Can't I? (Official Video)
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Answer 2
There may just be a glitch, and you will have to reload. Sometimes if your Wi-fi isn't good, then you won't be able to connect and see players. There could have been an update while you were gone and that could cause the game to glitch. Otherwise just reload or logout and log back in.
Answer 3
Sometimes, when there are two players on a map and one cannot see the other, the person who is invisible will have to re-log and this works most of the time.
Answer 4
I had the same problem. But I fixed it by reloading my game. Also since he could see you, try to ask him to reload his game as well. It worked for me. Hope i helped and hope you get it fixed.?
Answer 5
Invisible players will not show up on maps. Try to see someone without invisibility or a Bukkit plugin or a plugin bug or an error. It happened to me as well.
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