Flash based games not working

[Micha Silver]

Some of the younger members of the family play flash games (sheshbesh) 
on Walla's site. On Ubuntu 8.10 and 8.04 this worked well 
(flashplugin-nonfree). The 8.10 machine was upgraded to 9.04 and still 
the site worked OK. But recently, after some other upgrades, the game no 
longer loads- just the "sha-on hol". (Meanwhile on 8.04 it still works). 
We asked Walla's support and they haven't changed anything.

Any ideas how to work around this?

Thanks,

Micha