And all Sims in your household are affected ? How many Sims are these ? What happens if you change active households (for testing purposes, save your game under a new name) ? Are those affected as well ? Is it only the Martial Arts skill ?
Did the others Sims already have a certain level ? Did you do anything special when it started (like install a patch or EP) ?
Did you already move them out and back in via edit town ?
Ok,
I guess then I only have a mod solution for you I can't really talk about here. Google nraas overwatch skill modifier if you are willing to use a mod (at your own risk, not supported by EA) or google NRaas mastercontroller reset.
Sorry, I don't have another solution but pre-existing Sims like to get corrupted.
