I have a set up with an Essentia Provider facing into a Alchemical Construct set-up. And it's not providing the necessary essentia, I defiantly have enough of each Essentia available in my system.
It's defiantly online, I have enough channels on my network for sure.

I can provide pictures if necessary.
I tried to test in singleplayer, but I think the Cheat Sheet in Thaumcraft has been removed so I can't cheat in all the recipes and it doesn't allow me to create the Alchemical Construct with a Wand.

Tris~