Each time I try to respond to a post or PM - I click Send Message/Post and it tells me an error has occurred, that I already submitted this post... which is a LIE!

It has happened with every post or PM I have tried to complete today. I have been copying my reply - closing the window, opening it again, clicking the thread again and pasting my post in the spot and hitting post and then it works but its annoying just the same.
Thought someone should know!
Thanks,
Zoey