I went to yellow bridge and of course it mentioned the need for java and flash. I installed java and flash plugins and even went to the adobe site and got the install for ubuntu.
I am so relieved to see that Skritter animations work fine.
Your developers must have carefully chosen an animation method that will run on all platforms and avoid such problems.
I am enjoying using Skritter along with the Ubuntu pinyin, taking notes in an Open Office document.