Yes you can still access the old posts, click on disscussion (it is in blue) on the left side of the screen near the top. Then scroll down to the bottom of the list of topics and you can find them from there.View Thread
Right now something is wonkey when I open a post, I can still read the posts, but at the top of the page is all kinds of symbols and giberish. I am not able to reply to those posts when i have them opened.
What I tried that worked is to close the post and go back to the list of posts, if I click on Reply there, I can reply.
If any of you are having the same trouble try closing the post and replying to it from the "list page"View Thread