Unable to reply to a conversation

A forum member started a conversation with me.
When I try to reply to it, I get an error message on the page (not a pop-up) that reads "sorry, we are unable to find the page/content. Please use the links at the top of the page".
After a few attempts, I tried starting a new conversation, which does not see to work either.

I wanted to check if this was a general issue, or if it is my browser (safari).

Thanks