Map tiles missing from maps

When I logged in I though I had messed up a map but then realized that other maps I had left perfect were the same. Map tiles and tokens have gone missing. And uploading image files is hit and miss.  

Hello Declan O., I'm sorry to hear that you're having issues with the site. To rule out possible issue,  please 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!