If you whisper an inline roll to someone with your 3D dice setting enabled, all players in the game can see the dice being rolled, not just you and the target person. Example: /w gm [[d20]] will result in all players in the campaign seeing the 3d dice roll. (I know this can be worked around by doing /gmroll, but this was encountered when my GM modified an API script that normally displays a roll result with extra data to only send it to himself; he was trying to change it so that only he could see the results of the monster attacks, but due to this issue we were still able to see his damage and attack dice rolls.)