I tried changing some characters' battle sprites and everything goes fine until a battle starts. Instead of the sprites I have selected, the battlers appear as Vermins. I've tried with five or six different sprites, but they're always replaced by Vermins. Is there any way to fix this?
Were you also trying to change the characters' classes? If I remember correctly, making them the NPC class will result in that issue.
Also... How are you doing this? With the new sprite editor, or with the editor's ability to assign different icons to PC's?
Also, you're not selecting sprites that are highlighted red are you?
Nope, I didn't even touch classes. And I've tried both red highlighted (which I suspect don't work correctly) and not highlighted. Later I'll go test more sprites in order to see if at least one of them works.