[ubuntu] no sound after upgrade and reboot

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http://ubuntuforums.org – Update manager updated a few libs recently (can't remember which ones, but it was definitely not linux headers). Then, after reboot the sound stopped working. The song in rhythmbox would go on playing visually and there is no indication in Sound Preferences that the hardware is not working properly. Yet no sound is coming out of speakers. I tested the sound card in windows - it worked, so it's definitely not the hardware problem. I have Creative Sound Blaster Audigy 1 card and Ubuntu 9.10 x64. Any ideas? (Hardware)