I would agree with the software glitch. I had problems as well on TBD because they required all non-member posters to re-sign up. I had to use a new handle (subtle difference, from "Big Kahuna" to "Big_Kahuna") because I couldn't log in with my old one.
It also appears that I can only post one message at a time now, with a waiting period in between (480 seconds?). That may be a non-member thing, I don't think it's just me.