I've gotten half way through Level 12 in Spanish and it won't let me move past that...
How are you getting stuck? What are you unable to do that you think you should be able to do?
I completed the lessons to a certain point...midway between 12 and 13, but it isn't offering any more lessons to continue.
I completed Verbs: conditional perfect
It looks like you just learned every skill in the tree. THAT'S AWESOME! :-D Now you have to go back and master every skill.
the 2nd module under the Conditional is broken. It will never end.