I'm not sure exactly when it occurred. All tokens in question have "has sight" set. I select a player token on a map with dynamic lighting enabled. I press [CTRL]-L to view the lighting from their point of view. No lights that are not set on the player token itself are viewable. If I create a token that I can use (with my name alone) and join as a player, I can see all lights set to "all players see lights." If, however, I [CTRL]-L while in GM mode on that same token (set to controllable by me) - it cannot see any lights set to "all players see light." In the moments before I press this key combination, I as the GM see the light coming off of the tokens set to emit light. Once I select the token and press [CTRL]-L, I fail to see any light at all, despite selecting a token for view that has sight (verified by joining as player) and which is under my own control (again, verified as joining as player). The ONLY light I can see in [CTRL]-L mode is that emitted by the token itself. I don't think it is a case of hardware acceleration or browser settings, as it only occurs (failure to see light sources) under the GM-using-[CTRL]-L mode.