I posted this on the Sandboxie forum and basically got no where: http://forums.sandboxie.com/phpBB3/viewtopic.php?f=11&t=18403 When I run Firefox 27 in a sandbox, any flash video imbedded via UBB code on a message forum will not show up, but it will if I downgrade to Firefox 26. A few people in that post above have not had this conflict; apparently it's something to do with how my system is setup. I have Flash PM disabled and plugin container disabled. . Windows 7 is my operating system. Does anyone who's knowledgeable on Sandboxie have any clues as to why this would happen? Thanks for any help guys!