Hello,
I have LiquidMix running on win 7 x64.Too bad it's not supported anymore (no windows 8).
Set the legacy Firewire Drivers and use Jbridge.
http://jstuff.wordpress.com/jbridge/ That works for me:
Install latest LiquidMix Drivers
Install the JBridge beta v1.6 (I had graphical glitches with 1.5.Try both)
Set all JBridge .exe and sonar to "Run as administrator" (compatibility in properties)
Make a plugin scan with disconnected LiquidMix (I had scan to hang with hardware connected)
Acknowledge that hardware is disconnected.
Open plugin properties and check the launch using JBridge box
Connect the liquidmix
There you go...Works for me