One player (only one out of 6) can see whole map as if he is the DM

Hi all, I have one player who now, on various maps, had the 'pleasure' of seeing the whole map from a DM point of view. The other 5 players were affected with Dynamic lighting and couldn't see everything. I had him log off and log on again and used a different token but I'm unaware of any setting which provides DM vision to a player. Is there something I can check? And if not, how can I avoid situations like this? Thanks.

When you say "DM point of view" do you mean that they are ignoring dynamic lighting settings, or they can see the page menu, and other GM interface items? If it is the former, have them check to make sure they have JavaScript enabled in their browser. If it is the latter, make sure they have not been inadvertently promoted to GM in the player list on your game's home page.

Hi Nicholas, I don't know yet :) I've re-created his character, just to be sure and we are testing this sunday again. His Javascript is enabled and I checked, he is absolutely not a GM. It happened 3 times in total now, on different maps and in 2 different games. It's ignoring dynamic lightning, but also seeing what is on which layer. I'll keep you posted!