WeakAuras got broken (again)

Greetings,

My WeakAuras addon stopped working apparently with no reason.
It can't even be opened via the /wa command, yet the game recognizes it as a valid command as it is not complaining about that.
Furthermore most of my auras (not all of them) stopped working.

I guess the issue is related to the file where the auras are stored (lua files?) since:
1. some auras are still working
2. downloading new addon files did not solve the problem

This is the second time it got broken, the first time I found no other way then a clean install (so building all my auras again)

Is there a well-known solution without loosing all my auras, or at least a way to debug these kind of problems?

I'm playing on Frostmourne so I'm using the wotlk version.