asterisk users - Sep 2008 - AGI defunct processes + GSM Playback - HELP!

Hello.
I've just installed
asterisk-1.4.21.2
zaptel-1.4.12.1
chan_ss7-1.0.10
libpri-1.4.7

I am using Sangoma A104 card with wanpipe-3.2.7.1 drivers.
My OS: Ubuntu 8.04 Server
Kernel: 2.6.24-16-server

I am getting a choppy GSM playback and too many defunct AGI processes when
channel closes.
i am using Perl or PHP, also 'agi-test.agi' going to defunct too...

I was able to playback GSM files and running AGI with older version of
Asterisk and Zaptel very well.
I've just upgraded my servers to latest versions but it's too buggy now.

Any ideas?
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