[mendesitba]

Greetings!
I'm having some problem with the kindle vocabulary building, maybe someone of you could help me.
Basically, the issue is that some words saved in the vocabulary building do not have any definition (although when I had selected the same word on the document, the definition was there).

It does not happen with all documents, only some of them. I tried to identify some pattern and that is what I noticed: For instance, in a bilingual book bought at amazon.com only Portuguese words work while English words do not have the definition on vocabulary building (and again, definition of these words appear automatically when I was reading the book), the same happebs on bilingual "personal documents" sent by email. But on this case, the English words definitions do not appear automatically when I'm reading the document (I have to change the dictionary to English). On the other hand, on English only books or personal documents, the words saved to vocabulary building works well, they show the dictionary definition.

Someone know how to fix it? I would like all my words, or at least non-Portuguese ones, to show definitions when I'm using vocabulary building.

Device: Kindle Paperwhite