I have a cloned map. (Max zoom out, if it matters.) One clone is in a map frame at base. The other is in regular use. AS of 13w02a the white pointer has completely disappeared, even when I'm well within the map bounds.
Related issues
duplicates
Comments

Duplicate of MC-4068.
Are you sure it's a dupe? The pointer disappeared long after I placed the cloned map in the item frame. I had been using the other copy regularly in the interim. Then it suddenly lost its pointer.
Haven't been to the edge of the map yet, sry.
MC-754 - found another one.
same here.
created a map
made duplicate
put one in frame
after a while, my white pointer didnt move and was fixed at the maps location (over the green point)
after a restart of the server, the issue did not occur again (until now, 5 minutes later)
server: 1.5.1
I have the exact same problem as Philipp above.
Running a 13w38c server.
Restarting the servers solves the issue for a while, but it keeps reoccuring.
Same issue here, would love to see this resolved as it makes it very difficult for me to explore. I have three maps and my white pointer shows up on none of them.
If you stand at the apparent edge of the map, can you see the white pointer poking out from underneath the map image?