I am not sure how many of you have been experiencing an issue with your priest mind control not showing you the pet bar for your targets powers or your hunter/lock pet bar not showing up.  This issue has been driving me crazy since the patch and I have come up with a solution that does not involve downloading an interface mod, all you have to do is create 2 macros.  

Macro 1
/script PetActionBarFrame:Hide();

Macro 2
/script PetActionBarFrame:AllowAttributeChanges();
/script PetActionBarFrame:Show();

Take each of these macros and drag them to a side bar for use when you have aquired a pet and do not see their bar.  All you have to do is click on macro 1 and then macro 2 and it should show your pet bar.  The first macro will hide your pet bar in case there is any junk data causing issue and the second will allow the bar to be altered (which during combat it is technically protected and why this problem is occuring to begin with) and display it.  This saves you having to reload your interface which takes quite some time to load.
-ShadowStride    

As a note for the priests, you need to load macro 1 and 2 previous to mind controlling once you enter a zone.  Ie if you enter an instance, hit macro 1 and then macro 2 so that you have the space allocated for your pet control area.  This can be done at any point out of combat once you zone. 
-ShadowStride