If you disabled or enabled rules, and didn't hit the "Activate Rules" button, maybe. Otherwise, I'd say grab a debug and open a support ticket. Get the debug soon so that any relevant breaks might still be in the data.
- SSH into the LEM
- Go to he MANAGER menu
- Run DEBUG, follow the prompts
- Open a support ticket (https://customerportal.solarwinds.com/support) and attach the tar.gz