I had this issue when I tried to post a new thread in ANY forum topic. No matter if I used Firefox or Google Chrome. I finally gave up, shut down my laptop, and went to bed. This afternoon I was able to post without any kind of error. The error I kept receiving was when I clicked on submit, the thread looked like it was processing, then a box popped up that said "No Data Found". All I could do was exit out. Hope this helps a little in trying to figure out what the glitch was.