I noticed this, so thought I'd share for others...
For the tomes, you have to be one to use one. What I mean, you have to be a dervish to use a dervish tome.
Fortunately, there's a work-around... it applies also to your secondary. So if you can't use a tome, change your secondary and your good.
Just an FYI.
Something to share about Tomes...
MSecorsky
Bryant Again
I kinda felt it was a little self-explanatory when I first heard about it. It wouldn't make much sense to gain a warrior skill if you a Me/E. It's cool to have things cleard up, though.
MSecorsky
It's understood that it unlocks skills you've already unlocked. What I would like to make clear is something that caught me at first... I went to use a dervish tome I found and it told me I have to be a dervish to use it. I changed my secondary to dervish and it was fine.
Ouchie
I'll add one point
Elite Tomes count towards Skill Hunter Title
Elite Tomes count towards Skill Hunter Title
FelixCarter
Thank you, MSecorsky. I, personally, did not know this because I have not yet used a Tome. I'll keep your advice in mind if I ever nab one and decide to use it.

Bankai
I think you've saved the days of a few forum lurkers, who've gone mental because they can't use the elite skill tomes they bought for a lot of money.
Yichi
personally, there should be a lvl cap or a certian situation that u have to meet before using a tome. a lvl 10 in ascalon arena using searing flames is bullshit. At least thats how i guess they got it, if not, then they went through a hell of a lot of trouble....
Seef II
Elites are locked in the low level arenas.
Ritual del Fuego
Something else I noticed (if this was posted elsewhere, forgive me I haven't been reading the last few days) is that the drops are profession specific. Meaning, I got elite ele tome drops from ele bosses, elite dervish tome drops from dervish bosses, etc. Don't know if it was coincidence but that has been my observation so far.
mr_groovy
Thx for the heads up anyways
I noticed that the tomes correspond with the prof you kill. Rangers loot Ranger totem
Now if only a Axe warrior would drop a Totem Axe



XvArchonvX
Damn! There goes my shot at getting an Elite Mesmer Tome to use Echo + Mending on my W/Mo.
lol

lol