Just joined the mages guild, went to the spellmaker, and made an identify spell.
But when I cast the spell, it appears a window which is just like what you get by asking the mage in the guild for item Identification.
Then I drag my items to the window, and click the "Identify" button, it ask me for drakes. For 50 septims.
Is it a bug or? I download my game from that French gentleman's website(Ancestral Ghost).

If you cast the spell in the guild it will charge you every time. Try it somewhere else.