Silly question, you have turned it on in the addons screen, right?
You have both an init.lua file naming the addon, and a load.lua file in hooks listing all the files its meant to have? (Not literally all)
Okay, now I feel stupid... again...
I had disabled all the other addons, because I didn't want to cause any trouble.
If I had just taken the time to read them... anyway, hexkin V'0.05 is now on the site! http://te4.org/games/addons/tome/hexkin
Fix a bug where the icons for "paws and claws" and "rebound" weren't showing up.
Some descriptions have been added to a few things, but they still don't do anything.
The fill in speed has been reduced to 50%