I've made 18 trainers, one for each of the skills. i've followed the same steps for creating all of them:
* adding the trainer class
* adding factions
* adding the TrainerGoldScript
* adding dialogue to the trainers

everything as explained here: http://wiki.tesnexus.com/index.php/Adding_a_Trainer_NPC_to_Skyrim

The problem is that this method works for most of the trainers: they say the dialogue line and the training dialogue opens without problems letting you train. But there are two exceptions:
* The Block training is offered but the NPC won't say a word (this is bad, but not too much)
* The Enchanting traning is not offered and the NPC won't say a word (this is really bad!)
I don't understand why what works for 16 skill trainers and doesn't work for these other 2!

I've tried everything I've think of, with no effects:
* changing the NPC that trains in those skills (just in case the NPC was bugged)
* changing the place where the training is offered to a place where other training is offered without problems
* changing factions of the NPC offering training
* changing the trainer class

None of these has worked, it doesn't matter where or who offers Block and Enchanting training, the result is the same.

I've also tried to debug what happens when those dialogues are selected, but there is no trace in the Papyrus log.

Any ideas on how to fix it (anything will be appreciated, I am completely at a loss right now ). Or on how to debug what is happening with those skills?

Thank you in advance