So I recently posted about a Dynamic Light Failure which (among other errors) ruined an entire session. In short, some players could not see anything while one could see the whole map. I was given some advice about browsers and extensions. The player switched browser and so far, seems to be ok for that player. However, I was playing on Wednesday with two of my players, both started the game with DL working just fine. Then all of a sudden the entire map popped into view for one of the players (not the same player as before). She was using Chrome. She switched to Firefox and all was good. This cannot be explained by simple browser issues as it started off working and then half-way through the session it failed. I'm currently running the purchased campaign The Sunless Citadel. This is most frustrating. GMs need to be able to rely on the system not revealing secret parts to the players. Thankfully this one player was honest. I would be grateful for a permanent solution to this issue please. Apologies for the agitated tone but its very frustrating to purchase content that is not working properly.