I know you said 'suddenly', which implies no changes to your setup, but before we delve into deeper troubleshooting... First, restart your browser and try again. Seriously, turn it off and back on again. :) If that doesn't work, then please carefully work through the first three 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 and anti-virus programs. Step 3: Clear your cache If none of the above succeeds, please thoroughly work through Step 4 . (Don't forget the complete Console Log, starting from table loadup and continuing through trying to upload two different images!)