Spells not adding from compendium drop

Dropping spells from the compendium to the 5e sheet by Roll20 does not work. Says "accepting drop from compendium" but nothing happens. Also, any search finishes - blinks - and then re-executes the search. This has left a "ghost" spell from the first search stuck on my tabletop partway dragged to the sheet. 

Hello Pat, I'm sorry to hear that you're having these issues. To rule out potential issues, 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  Step 4 .  (Don't forget the complete Console Log!) Thank you!