I have been using Ubuntu 10.04 at least 2 years now , i also play imperia-online and on that game I do not have any flash problems.
I even got to playing the new version imperia-online (much more flash action) besides the old one and both work without a glitch.
The problem seems to be in the display of potions,food,weapons and jewelry, there is no problem with the battle -screens (both challenge and normal).
And I think I have made a mistake between accounts.
For Imperial Hero my nick is
Calmness and I play under English flag.
I have tried again in Google Chrome and the results for the hero-screen are still awful but all other tabs like skills , Stats, Avatar and Cache are all right.
This is a screencap from Chromium:
https://picasaweb.google.com/lh/photo/LmgbupW6mrncf9j9JIicXg?feat=directlink