Bukkit

What steps will reproduce the problem?

player A gets a horse, and names it Bubble.
Player B sees the horse and likes the name so names his one Bubble too.
From that point when you summon the horse Bubble u can actually call both.

My admin sent free today one named Grumm (upside down) and in front of my eyes freed someone else's too with the same instance

What is the expected output? What do you see instead?

I would expect the plugin to realize the owner too not just the horse's name.

What version of the product are you using?
: MyHorse 0.3.1 Beta for 1.7.4

Do you have an error log of what happened?
nope (there is no error in the console)

Please provide any additional information below.

Craftbukkit dev 1.7.9

actually just thought if you would not allow to have names already in use probably would solve it all..

also have the horse being very far away issue too might be silly but i feel it depends if the chunk where the horse is loaded or not?