I wouldn't fret guys. I am sure this will eventually be solved. It does seem to be a software issue, and if so, this cannot be an isolated incident. The question is does this effect only this model, or the other models that has the THX feature. If this update serves the other receivers with THX, then Onkyo will either have to make a fix now, or they may decide to wait until the next update. As popular as the THX is with movies, it would make sense for Onkyo to make a fix available as soon as possible.
In the meantime, what you could do is join the Onkyo forum and see if this issue has been brought up on their forum. If you do not find any articles pertaining to this issue, then I would start a thread and see what the Techs can find.
I have provided you the link to the
forum. Please keep us informed. I'm sure you will not be the only one with this issue.
Admin & Mods... If Audioholics has a fora regarding issues with certain brands, i.e Onkyo, Denon, Pioneer, etc., you may want to consider adding this thread for future reference