Problem with audio while playing sounds in several user accounts

mac os x 10.6.8, mac pro 8x2.26, internal soundcard's linear output used.

there 2 user accounts in os. if 1 user opens browser (safari , opera tested) , loads page sounds (e. g. youtube) , plays sound , switch other user's account, there won't sound audiocard, system's.

if switch first user, sound appears moment while switching.

if stop sound playback in first user's account, second user able play sounds.

problem appears non-web applications, e. g. vlc, not always.

p. s. there pcie soundcard installed in system. hasn't problems.

p. p. s. sorry barely understandable english.

 

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