Eu finalmente resolvi isso. Essencialmente, a solução é remover todos os dados do aplicativo para flash. Aqui estão as instruções que eu segui se alguém encontrar este post:
Let's try the following: Close your browser windows In Explorer, navigate to the following folder: C:\Users\username\AppData\Roaming\ (the easiest way to accomplish this is to type %appdata% in Explorer's path bar.) Delete the Macromedia folder Next, go into the Adobe folder and delete the "Flash Player" folder inside. Finally, go to "c:\windows\system32\macromed\flash" and look for an mms.cfg file. If one is present, please rename it. Once complete, try those offending sites out again.