You might see this prompt on your Citrix clients when they browse to a internet web page with flash contents.
Do you want to optimize content designed for Flash, such as videos, animation, and applications?
If you would like to disable flash redirection and also skip the prompt, you can use these Citrix Policies.
Flash content will then always be rendered on the server, please also note that this is a user setting, so if the policy is applied to the Xenapp servers OU, loopback processing mode must be enabled.