Custom aura buff art using the wrong model

Greetings.

I'll get straight to the point.
I've got a modified version of the Unholy Aura that lowers enemies' regeneration rates instead of increasing allies'. I've also got the normal version of Unholy Aura that increases regeneration rates and speed for allies.

I set the custom aura to use a different buff, and I replicated the original Unholy Aura buff's information on the different one exactly, and then I changed the buff art from the light blue generic model to the Unholy Aura main model.

I changed the new ability to target enemies, and started up the map.

However, instead of using the Unholy Aura main model, it still uses the light blue one.

Thinking that there might be some kind of conflict wherein the new ability was using aspects of the old buff, I changed the original Unholy Aura to have a different buff model. It used the properly changed buff art.

So, what's up? Can custom aura buff arts not be changed?

Please don't suggest that I use Immolation.

EDIT: I mistyped, and experimented again since. I changed BOTH auras to the Unholy Aura model, and they both worked. What's up?

This problem seems to be the same as the ones experienced with, among other spells, starfall and blizzard. They will always, for some reason, use the 'standard' effect art, and can only be changed by replacing the original art: The same seems to be true for unholy aura.

I'd suggest removing the art from unholy aura completely, and adding the effects either using special effects or a 'sphere' type ability: Just add the effect or ability to units affected by the buff, and remove them when the units no longer have the buff.

You could also try basing the negative aura off a large-area low-duration disease cloud, edited to look like an aura. That *should* work.

The Disease Cloud is what I'm looking at right now, although it continues to do damage even when the units are outside the cloud. Thanks for your help.