Yes it does flicker when hooked directly to the mac without going through the WD thunderbolt drive. It will randomly do it in preview mode. To clarify the source is 1080i 59.94 not 1080P as stated earlier. I have tried changing thunderbolt, stereo, and component cables to see if they were the issue and I don’t get a different result. I read the post from Gary Adams about the u-verse box, that could be the issue but unfortunately that’s what I got this device to record from so I could archive the shows I want in HD for personal use. I would gladly use HDMI but as we know the intensity does not decode HDCP encoded HDMI signals. A side note about the u-verse box I do use HDMI to the TV but component to the intensity, also to note that while the u-verse box does output 1080i signal to both ports (HDMI & Component) at the same time I do have to have the TV on with HDMI active before media express will even see the 1080i signal from component port of the u-verse box which is sort of odd. I have used a slingbox hooked up the same way to component for some time and the tv never had to be on for it to see the u-verse 1080i component signal. Some other troubleshooting I did try was running the component cables through a Sony receiver back to the intensity to see if that cleaned up anything signal wise but it didn’t make a difference. Perhaps the intensity is too sensitive to the analog signals from this source? Is there any type of logging when trying to capture that might show any errors etc for possible software fix?