Garbled VM audio on SUSE 10.3

I have installed the 1.4.18.1 from Asterisk.org with the Zaptel drivers. I get very garbled audio on the voicemail prompts, but not the messages.
When using the Asterisk-gui I can not set up the Zaptel card as the Hardware tab does not show up.

However:

When I use the same computer with the AsteriskNow CD, everything is fine. The VM is perfect, and the AsteriskGUI is fantastic.

What am I doing wrong?

What version of GCC are you using ? Have a look here:
bugs.digium.com/view.php?id=10226