a) ...are not a druid
b) ...did everything right
c) ...don´t have "disturbing items" in your inventory (do NOT ask me now which items disturb the mana flow)
Until now, I can´t say anything else but retry it. I´m not a technical guy, so I can´t really help you.
First of all please edit your post.
Dont tell on the boards what you need to get runes from the runestone.
Then please check what Estralis said, especialy point c).
Leave everything that might disturb you in your depot, dont carry anything that blocks the manaflow with you or keep it nearby.
It is a known problem, some of the guardians upon offering the gift to not give it. please bare with the illarion team, im sure they are working upon it.
A other question. What is with the possibility of teaching? Is there this bug possible too? Me has tried to learn somebody Kel and the book vanishes..but the scoolar has no rune.....
Despite that horrible grammar, I'll answer that: They haven't properly incorporated it yet (soem of the programming is there, but i am pretty sure that it isn't finished or at least not debugged). You have to teach them the old fashioned way right now.