So I have a game of Curse Of Strahd that myself and my players have been doing for a few months now.. tonight they were travelling from Krezk towards the werewolf den... I had a self made map to do an encounter on during the journey.. simple map, stanard size, nothing over the top.. i laid a transparent fog thing on it covering the map do give the impression of the opressive fog that is everywhere in this module... they completed it np.. and moved on to the den, I swapped them on the map list to the werewolf den map.. and the game screen switched to the load screen.. and that is where it has stayed since then.. neither myself or any of the 4 other players are able to get the page to load.. just a big black screen that says ROLL 20.. loading etc... plz help ! thanks