Currently Lock & Load and SliceX / TrackX / DriveX cannot work on the top level of multicam clips. You must go inside the angle editor and apply these plugins to individual angles. If needed you can blade the angle in order to only track or stabilize sections of an angle.
We expect to remove this limitation in an update in the near future.
Isn't that false advertising? Your website states that it natively works with Multicam clips but doesn't state that it only works on one full clip on one angle vs having multiple clips on one angle (top level). This is definitely not a time saver =( What if you grouped multiple clips from 1 angle together so the grouped clip is now top level. Couldn't we stabilize that way?