Well its not that you need 24Hz to get it working.. But looking at your resolution table with all those weird resolutions. This is were your problem lays.
The Teranex will
ONLY accept broadcast resolutions. So anything that is not conform the Input resolutions mentioned on the website / manual will NOT work.
https://www.blackmagicdesign.com/produc ... /techspecsSD Video Standards
525i59.94 NTSC, 625i50 PAL
1.5G-SDI HD Video Standards
720p50, 720p59.94, 720p60
1080p23.98, 1080p24, 1080p25, 1080p29.97, 1080p30,
1080PsF23.98, 1080PsF24, 1080PsF25, 1080PsF29.97, 1080PsF30
1080i50, 1080i59.94, 1080i60
3G-SDI HD Video Standards
1080p50, 1080p59.94, 1080p60 levels A and B
2K Video Standards
2K DCI 23.98p, 2K DCI 24p
2K DCI 23.98PsF, 2K DCI 24PsF
Ultra HD Video Standards
2160p23.98, 2160p24, 2160p25, 2160p29.97, 2160p30, 2160p50, 2160p59.94, 2160p60