My players can't see anything

Good afternoon, my name is Dario and I've been a user of Roll20 (free versione) for over a year;  yesterday I upgrade my subscription to Plus (I'm the GM anche I want to upgrade the game for my players) and I tried the Updated Dynamic Lighting, the Advanced Fog of War ecc. The result is that none of my players (or me as a player in my own game) can't see anything, only a wall of black (neither the tokens are visible). I looked for a solution everywhere, I saw videos on Youtube about the argument, checked every possible problem (every player has sight, all of them can see lights, I tried Night vision On ecc) and today I don't know what to do. I created different games to test it and the problem persists in all of them, I wrote a mail to Roll20 and I hope to have an answer, but at the moment I ask all of you what I can do.

Hi Dario, Some things to check: Verify that the token in question has sight. Verify that the token represents a character and that the player has control permission on that character. If it is not emitting its own light, make sure that something on the page is emitting light, and that the light is not blocked by DL blocking lines. Make sure that regular fog of war is not enabled. This feature acts as an opaque mask over the play are that you can reveal areas from. The default when activated is the entire play are obscured. It must either be deactivated, or you must reveal specific areas.

My vision as GM My vision of the same map as a player All the token have sight and they represent a character; one of them emits light and there is the brazier at the center that's emitting light and the regular fog of war is not enabled (I don't know why there's that white triangle; there are two of them in the map, one at the top and one at the bottom in every map)