i am also getting this flickering problem. its all fine on VGA monitors (i've got dual VGA monitors), however on video monitor (though the USB box, comes with Liquid PRO) the video flickers. There is no other USB devices.
you think it could be some internal power related issue?
should i pump up the video RAM?
should i increase System RAM?
Full Specs: 1.7 Xeon DUAL Processor, 512Mb RAM 40Gb Root Drive SCSI, 160Gb Video Drive, Adobe Premiere Pro, Pinnacle liquid edition pro 6.0, nVidia 5200 AGP 61.77 with DirectX 9.0c