What do you mean by "acting up"? Could you be more specific about what it's doing?
I use GupPet as well and haven't been having any issues at all with it - I use it on toons that have all the different riding skills, a couple of mid-level druids (one with flight form, one without), and a high level shaman.
I haven't found any problems with the addon currently.
__________________
-- Taryble
|