sound disappeared when transition from linux_base-fc4 to linux_base-fc6

[Dmitry Lunts]

Hello,all!
The problem is as follows.
A couple of days ago I did transition from linux_base-fc4 (default
linux support module) to linux_base-fc6. The purpose was to install
skype, which rquires at least linux_base-fc6 support. Along with this
I completely reinstalled ("pkg_delete" then
"make install clean" from week-ago portsnapped ports tree) all the
dependent ports, including
linux-flashplugin-9.0r159 and nspluginwrapper.
The rusult is: skype works OK,
but sound completely disappeared when when watchin videos from, say, youtube.
Sound system itself works OK, as well as skype, too :-))
Could anyone give me a hint or readdress me to the right mailing list?
Regards,
P.S.OS FreeBSD 7.1