Focusrite LiquidMix on Tiger→Leopard upgrade August 11th, 2008
Here's how to get your Focusrite LiquidMix running again if you're on a Mac OS X Tiger install that was upgraded to Leopard:
Create textfile /private/etc/sysctl.conf and reboot:
kern.sysv.shmmax=536870912 kern.sysv.shmmin=1 kern.sysv.shmmni=128 kern.sysv.shmseg=128 kern.sysv.shmall=131072
My Focusrite would only work on a virgin Leopard install, now it works without a problem on my Tiger→Leopard upgrades too. Courtesy of a very quick support email to Focusrite.