Am trying to connect a Caldigit TS3 plus to my Razer Blade 15' onto a Samsung C27F390FHE 27" monitor using a Aten VC986 DisplayPort to 4K HDMI Active Adapter and having no success. 

Have tried several other adapters (as Caldigit annoyingly just as a Displayport no HDMI) as note it has to be active not passive but still no joy. 

Monitor work fine when I plug it in direct to the the Razer, and Razer is connecting to the Caldigit fine via Thunderbolt connection. 

Any ideas, do I need to go for a tried and true brand adapter, didn't expect it to be this fussy... 

Cheers