Why can I no longer paste my composed words into my USMessageBoard posts?

[Supposn]

It's my practice to compose, grammer and spell check my messages within word software prior to pasting them into my outgoing forum messages. I still continue to do so within all other internetforumg roupsf but I'm no loger able to do so when posting to USMessageBoard forums. Why is that?

Respectfully, Supposn