Using a 64bit OS, I guess? If so, this is an old issue, and apparently a tough one to crack for the developers. If I am right, the sandboxed browsers are not so much "having issues with Flash", but failing to load up your Flash plugin (and a couple others you might not even notice are not running) when you launch your browser .
But maybe you meant something else by saying "Having issues with Flash"? If so, please clarify.
Is there a way to allow flash to be virtualized as well without allowing all addons via the Browsers All Setting check box?
Not that I am aware of. It
will load up sooner or later, if you are stubborn enough. Just keep running it sandboxed and checking to see if they (plugins) loaded right. Success/fail rate greatly varies, i.e. sometimes it loads up right 5 times in a row sandboxed, sometimes it fails 15 times straight(
).
Also is there a way to allow the sandbox to delete contents when IE and FF are closed or does it have to be done manually?
No, but that is a decent idea, add it to the wishlist on this forum maybe.