This is still occurring in the latest version, I have updated the affected versions.
Its not exactly a bug, but something that has been overlooked.
Thanks
Outlaw11A
Yes, what Stephen says is correct.
It is easy to recreate by creating multiple players. Once it goes over a certain threshold of players, it stops displaying all together.
If you would like, I can test how many this is.
Thanks
Outlaw11A
Attached the crash report.
Exactly the same here (Windows 7 Home Premium 64-bit)
Confirmed in Minecraft 1.6.4. Updated the versions.