Hi RoBsT44,
Had a look on the different sections but I haven't found any explanation on why threads appears as "Non Valid" from time to time...
Post a message in the "Dead Thread" on top of the page a couple of days ago but sounds like it wasn't the right place (Sorry).
Just wanna report then (as you're the author) than the Hegre-art thread have got that "non-valid" status for a while. Can you fix it? Thanks