I've seen this mentioned on the boards before but last night it happened to me. I traded a +6 CON Ring for a +2 Dex tome I picked up during loot weekend. I went to the mail box, clicked on the tome and poof, its used. Thankfully, the guildie I'm trading to is very understanding, but now I've got a +2 DEX tome on my sorcerror!? I contacted in game support who said they counld not help me. (No surprise there.) I guess my click to drag and drop it to the mail was screwy and came up as double click instead of click <drag> and drop.
Can we PLEASE get a "Do you want to use this tome Yes/No" dummy box before tomes are applied given they are 100% permanent. This is no different that when you level up / are these the skills and feats you want?
I'm going back to my cave to cry.
-Pryn