I am not sure if this is on Skyrim as well but sometimes when I try to summon a atronach/daedra, my character disappears for a few seconds. It is common when I am using dragon aspect.

Also, every time i try to summon a seeker, it sometimes fails to conjure.

This is a disturbing bug and gets annoying sometimes.

Do you have spell absorption?

Is that a perk?

More info:
http://www.uesp.net/wiki/Skyrim:Spell_Absorption

Well thats not it really when I looked at the bugs. I dont lose my magicka, its like trying to summon a daedra (or whatever) in the sky but it doesnt work. I dont use the atronach stone, I am not a breton and I do not think I have the atronach perk.

Check your spell effects and see if you have any spell absorb, don't forget Azuras blessing gives you 10% absorb as well~

Azura's Blessing gives 10% Resist Magic