When you Recharge the Vacillator, a dupe delivers the recharge but the building doesn't go back to the ready state, it just stays stuck in the "recharge requested" state. The building fixes itself with a save-and-reload (so no point in uploading a save file).
Given a ready vacillator and a spare charge:
- Assign a dupe to the Vacillator.
- Something feels different, complete the process.
- Click the Recharge button.
- Wait for a dupe to deliver the recharge.
- After a few seconds of animation, the vacillator should go back to the "charged" state.