I'm temporarily going blind in one eye, which makes things blurry, so I wanted a really big monitor. I bought a Wal-Mart Sceptre 43" 4k TV, but when I plugged it into the last place on my Thunderbolt daisy chain I got a horrible color cast - very pink - and there was no way to adjust the color to make it acceptable. But when I plugged the DisplayPort-to-HDMI adapter directly into my 17" MBP (quad-core i7, single Thunderbolt port, 16GB DRAM, 1TB SSD, 1GB VRAM, Thunderbolt Display) , the problem went away, so I knew it wasn't the TV. There had never been a problem with my HP 1080p DisplayPort monitor that worked perfectly for years on the end of the same Thunderbolt chain.
My solution: I finally remembered that one of my Thunderbolt docks had HDMI output. Plugged the TV cable into one of them and - drum roll! - problem solved! I have a CalDigit dock, but I'd guess that any Thunderbolt dock with HDMI would have fixed the problem. Note that not all docks support HDMI.
My setup: 17" MBP > Thunderbolt Display > AKiTIO Thunder Dock > CalDigit Thunderbolt Station 2 > Promise Pegasus 4.
Now I'm wondering if I can have a 3rd monitor by putting the HP back on the end of the chain? I'm guessing not, but I'll give it a try just to see!