I have a problem with my pet frame, which is not updated sometimes. No error but i cannot see the real life of my pet. Reloading the interface reset te problem.
I too have this problem. It only affects the pet bar as far as I can tell. The hp numbers on the right hand side are accurate, its just the actual bar staying at maximum fill. When the pet is targetted though, the target of target bar shows the correct bar fill.
Also chiming in to say, wonderful unitframes mod, it's great! :)