I noticed the analogous situation in Google Chrome (4.0.266.0, same flash version):
the flash plugin process consumes 100% CPU and the pages using flash are unresponsive ('reload' button works, though). When flash process is killed, the browser returns to normal work and displays info that flash plugin failed.
Same here.
Kubuntu 9.10, 32bit (2.6.31-16-generic)
Firefox 3.5.5
Flash plugin 10.0 r42
I noticed the analogous situation in Google Chrome (4.0.266.0, same flash version):
the flash plugin process consumes 100% CPU and the pages using flash are unresponsive ('reload' button works, though). When flash process is killed, the browser returns to normal work and displays info that flash plugin failed.