Changing Skeletal Mesh Stops Attack Animations...Why?

I have a character set up based very loosely on the Top Down sample. My character works fine, with a state machine set up that plays several attach animations in addition to the standard run, walk, etc. My character is composed of several meshes for the base character, plus some interchangeable accessories.

I have a few hotkeys set up to change the skeletal meshes associated with these accessories. (Basically, some armor pieces.) However, as soon as I change the mesh for an accessory, the attack animations stop playing. I have no idea why, so any help would be greatly appreciated.

Additional Info: Hotkey trigger attack animations. So, Key 1 fires attack 1. This works fine, UNTIL I hit the hotkey for “Change Armor Set”, which uses Set Skeletal Mesh to load the new asset. The asset loads fine, and is visible, AND the run/walk/idle animations work fine with the newly loaded asset. But the attack animations stop working.

Any idea why this is happeneing? I can post blueprints or whatever is needed, just not sure where to start.