Horizontal Line Artifacts - Decoding bug

I have several projects that are showing the same artifacts as in the video below. The artifacts are shown in the source monitor and don't appear in any other program including VLC and Davinci Resolve.

I'm on an up-to-date Windows 10 system, 2.8GHz i7 quad core processor, 32GB RAM, NVIDIA Quadro K3000M, but the problem is the same on a Macbook Pro. Premiere Pro 12.0 in both cases. Source footage is H.264 in am MOV wrapper, as well as AVCHD, all 1080p. Footage shows the same problems when transcoded to DNx or Cineform in Media Encoder. I updated my graphics driver today. I've tried clearing preferences, deleted caches, and reinstalled all Adobe products in the system using Creative Cloud Cleaner. Changing the rendering engine to Software Only does not help. So far the only thing that has worked is transcoding all the footage to Cineform in Davinci Resolve, attaching those files as proxies in Premiere, and then making the footage offline to force it to use the proxies for rendering. Because of their track record with me I've avoided contacting Adobe support until now, and I will either edit or reply to this post with any other questions, andwers, specs, or workarounds that Support tells me to try.