Unable to assign skills

I am not able to assign Hand of Chayula to any skill slots. It was working just fine until I slotted a new skill gem. Suddenly Hand of Chayula was removed from my hotbar and I cannot reassign it or drag it from the skills list. None of my stats have changed - I meet all criteria for the skill and support skills (40 dex for Hand and 52 int for Vulnerability). Removing support skills does not resolve the issue. Relogging and reloading the game did not resolve either.

I can recut a new gem into Hand of Chayula and the new gem will work. At the expense of a wasted jeweller's orb on the original gem.

Im having same issue. Happened after i disabled the skill on both weapon sets (the tiny boxes that are on bottom of the tool tip). Now the tool tip doesn't open again for me to assign them to any of my weapon sets. Can't drag them to my hotbar aswell..