Yes it is.
Apparently beyond a certain point they disabled the ability to use new animated avitars which is why I've kept the same one for quite some time.
Every now and then I see a new one but know that once I pull-the-plug on this one I won't be able to use another.
I believe the overall reason for the restriction was because some users chose some over-the-top animation that really distracted from the thread.
I don't think mine qualifies as that.