When copying only Tone Curve Settings and pasting it to a new photo that already has radial filters, gradient filters and or brushes, it deletes them altogether. I've tried with other individual checkboxes from the Light Group and it also overwrite filters settings. Lightroom v3.3
Thank you! Also, I noticed the Y hotkey in this version now opens the Activity Tab and no longer shows the original photo. Although the Show Original button says it'll be run with the Y hotkey. Just in case, I'm using a Spanish Keyboard.