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

[Dmitry Lunts]

Hello,all!
May be a bit off-topic, but...
 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 of what can I do or readdress me to the
right mailing list?
 Regards,
 P.S.OS FreeBSD 7.1-i386 RELEASE