I just got my MOTU UltraLite, and I'm having the same problem a lot of people seem to be having. At random points, the Ultralite decides to mess up and transform any output into noise. When no audio is playing, you can hear loud clicks & pops, while the meters of all the outputs are going nuts.
I've recorded a short video of the problem. Please note that I'm not sending any audio through the Ultralite at this time, and yet the outputs are going crazy:
The clicks you hear is what's coming through the speakers. The only app running at the time was iTunes, but the same thing happens with Sonar 7 (Producer Edition).
For this video, the Ultralite is plugged into my laptop using the built-in firewire port. However, I also have a Belkin Firewire Expresscard. This uses a Texas Instrument chip (like MOTU recommends), and the problem still occurs (though a little less frequently).
Finally, the boring specs:
Dell Precision M90 Laptop
Windows XP SP2
Intel Core Duo 2Ghz
Belkin FireWire ExpressCard
I'm powering the Ultralite using an external 9v adapter.
In any case, I'm extremely disappointed. I haven't been able to find a solution for this. What to do?