Can't see responses, error message, how to reply to post

Okay... I am able to log-in and post today (couldn't do that yesterday as it looked like I was logged in, but I wasn't), but now I'm having other issues.  I'm using the most current version of Firefox on a pc. 

Like several others, I cannot see replies to a post.  I can read the original post, but that's as far as it goes. 

Sometimes, when I click a post, there's an error message when the page loads which reads, "The website encountered an unexpected error. Please try again later."  

When I try to reply to a post, I am not sure how to do it.  I click the "reply" button and am brought to a screen that doesn't have anywhere to actually post.  <confused>  Here's a screen shot of when that happens...