Hello!
I am playing on Direwolf20 1.10.2 (version 1.1.3) server. Version of Botania is 1.9-339. When I try to shift-right click on beacon with terrasteel or gaia spirit ingot, the hand moves, but the boss won't spawn. If I ask my friend to spawn it, it works.

I just had this same issue.... do you by chance have an Iron backpack equipped (mine is bound to the 'V' key) ... when I un-equipped mine, the ritual started working again

Hmm,.. that might be it :) Can't check right now, cuz im not home atm.