Some of my players cant see background and each others token

Tokens are assigned to right players, and they all have the various characters in each others journals. They are in the same page/map and have visibility of each other. No fog of war. We have tried firefox, chrome and IE browsers. Players sitting on computers in the same room using the same connection does not see the same things. Some cant see each others tokens, some can see background others cant, even with the same permissions assigned. What do I do?

Hello John R., I'm sorry to hear that some of your players are having issues with the site. To rule out possible issue,  please have them carefully work through these steps of our guide to  Solving Technical Issues : Step 1: Make sure to use the right browser Please check if these issues persist when using both Chrome  and  Firefox. Step 2: Ensure that there are no extensions/addons interfering with Roll20 Please disable  all  add-ons/extensions. Step 3: Clear your cache If none of the above succeeds, please thoroughly work through all of the requested information in  Step 4 .  (Don't forget the complete Console Log! Thank you!