This seems really weird. A power issue seems possible, is the Cortex the only thing in the rack receiving power? Are you able to get expected outputs from patching the Cortex ramp generator, or other synthesized shapes to the Cortex encoder?
As far as waveforms, I think it may be hard to get good measurements of voltage levels and such at this time scale. I received my Visual Cortex yesterday and hooked it up to my Tektronix VM700A video measurement set, an awesome machine I should probably write up a separate post about. Mattes from the Cortex look very stable for me and the knobs give quite a wide range of chroma output when looking at the vectorscope display, it compares quite favorably to mattes from my Panasonic MX50. Hopefully there’s nothing wrong with the outputs on your VC and we can sort out what the issue is.
