I am Using Firefox 3.6.18 under 64-bit Kubuntu 10.04 (Lucid Lynx) LTS as I have been doing in the last 2 years.
Every update was done automatically.
I will clean my cache (again) and restart my browser as you advise but then if there is no change , I won't know what to do else.
I have done what I said here above and restarted my computer then also reinstalled the 64bit flash plugin like I used before for 2 years, nothing has changed.
I am sorry to say but this is a real letdown, I played this game now about 2 to 3 years and I never got problems until this month.