Hey there folks.
It came to my attention that the dialogue system was broken in the last build, turns out it was really a bug in the game. Actually it wasn't even a bug in the code it self, I just had to copy the code for the dialogue system in a new file and it started working again, seems like it was some kind of broken file on Gamemaker's system itself. In any case, the bug is fixed, just download and install the game again and it should work smoothly now. Please let me know if you have any other problem.
Cheers and thanks for the support.