I use cacoo.com that is developed in Flash (a tool to make diagrams).
Running it in Windows works fine. But in Ubuntu, it seems that it can't access the system clipboard, blocking actions like Ctrl+Z or Ctrl+C,V, etc., which I believe need to access the system clipboard.
So, how can I give permission to Flash to be able to do that? I think that would fix the problem.
I'm running Ubuntu 11.04, and I just installed it. Firefox is the latest version. Adobe Flash plugin version 10.