Emissive object blackout?

[EnvisMJ]

We're having a problem with emissive in our cave.

We're using an intersense wand to indicate an item on 'mouse over' to turn on emissive for it.

object.emissive([0.5,0.5,0.5])

Then, when you 'mouse over' another object the first object is supposed to return to it's original state, and the new object is supposed to become emissive.

object.emissive([0,0,0])

It works fine for some objects, but for others, when they're supposed to go back to normal, they go pitch black. More often than not, the ones that are getting messed up have baked textures while the non-baked textures are fine. Are there any image formats that react badly to emissive?