Computer to LZX

I guess this really isn’t an LZX problem but hopefully someone will have some ideas?

I’m trying to incorporate video from a Windows PC into the LZX environment. I have two paths and both result in the same error. The RGB output to the TBC2 is vertically out of sync by a varying amount. It generally starts out fine but after a couple of minutes, it jumps to a position generally about half way down the screen. Its only vertical, the horizontal position is always fine.

The computer only has DP outputs so I’m starting with a DP to HDMI cable. It goes to a Brighteye Mitto box (which only has DVI so I have to use an adapter). I have an AJA SDI to RGB box which I hook up to the TBC2.

I was thinking maybe this was too complicated so I bought a TV One HDMI - RGB - reduces the conversion points by a lot but it still produces the same error.

I’m guessing it has more to do with the computer output than anything else. Its an HP Z2 mini with both Intel graphics as well as an Nvideo Quadro T1000. I’m not entirely sure which output goes to which graphics system.