Over 100 IRE Zebra ?
 

My HD-100U Displays Zebra Bars in VF on all detect levels except when set to detect on Over 100IRE setting. Works fine when set to over 95 IRE!! Whats up?

I could see this happening if your camera's "White Clip" is set at 100 IRE instead of the default 108 IRE.

re: 100 IRE Zebra
 

Thanks, that was it. I had the clip set at 100 IRE. Works fine at 108 IRE.