[Pet Battle] Using NPC to heal fails

Log data:

[Normal] 20:33 - Go to vendor
[Navigator] 20:33 - Path Count: 40
[Normal] 20:33 - Mounting gound mount Obsidian Nightwing
[Normal] 20:34 - Vendor named Kennen
[Navigator] 20:34 - Path Count: 2
[Normal] 20:34 - [PetBattle] Revive Battle Pets spell not ready, wait
[Normal] 20:34 - Go to vendor
[Navigator] 20:34 - Path Count: 2
[Normal] 20:34 - Vendor named Kennen
[Navigator] 20:34 - Path Count: 2

have you done the first battle pet quest, with the healing one?

I'll see the option available on npc for fix issue  http://www.wowhead.com/npc=49803/kennen#sells

I had the same issue on another NPC as well (the one at Halfhill in pandaria)

Here is a log from an NPC in Dragonbone:

[Normal] 18:08 - [PetBattle] Revive Battle Pets spell not ready, wait
[Normal] 18:08 - Go to vendor
[Navigator] 18:08 - Path Count: 10
[Normal] 18:08 - Mounting gound mount Obsidian Nightwing
[Normal] 18:08 - Vendor named Risera
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Go to vendor
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Vendor named Risera
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Go to vendor
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Vendor named Risera
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Go to vendor
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Vendor named Risera
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Go to vendor
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Vendor named Risera
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Go to vendor
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Vendor named Risera
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Go to vendor
[Navigator] 18:08 - Path Count: 2
[Normal] 18:08 - Vendor named Risera
[Navigator] 18:08 - Path Count: 2

This one it would open up the "Lost pets" option instead of the heal pets.

Do you depend on the dialog boxes being at a certain location on the screen?  Because I've moved mine around.

 Xeon?