F5 Load Balancer with PMP

F5 Load Balancer with PMP

Hi,
I have 2 PMP (latest build) in different cities. All work ok going directly to them but when I use a F5 I get some problems.
The Loginpage loads ok, then I login 3 things can happen, the page get stuck "Initializing Web Client", or I get logged out directly, or I get logged in but after 2sec aprox the login "area" is seen on the right side as I need to login again. I read F5 is used by others... is there some setting on PMP or F5 side I need to set to make this work ok?
Thanks for any help!

Regards
Rob