Not sure how to help with all the issues, but you may need this package for audio to work with Adobe Flash streams:
sudo apt-get install libflashsupport
Did you guys perform a fresh Hardy install, or a system upgrade? Also, many of these teething problems will be fixed in 8.04.1. Hardy is a significant update and contains many changes (rewritten code, PulseAudio, Xserver/Xorg etc).
Nathan
Bookmarks