[X2Go-User] Firefox menu very slow

[Mario Giammarco]

Hello,
I have a kubuntu server with x2go.
I reach this as full kubuntu desktop from a windows x2go client.
I have just installed client and server latest versions.

Unfortunately firefox (ONLY firefox) has this problem: when I click something 
that should open a menu the browser hangs for around a minute, then the menu 
appears and I can use it.

What can I do? 

Thanks in advance for any help,
Mario