Mmm it's a very strange problem... I doubt that an os can be the cause, but maybe it's an extension of the 502 error?
Try the same solution: log out, delete cookies and log in again, then try to reply.
Have you checked the link in the status bar when you hover on "post reply", it should be like this:
Code: |
http:https://www.forumophilia.com/posting.php |
Maybe you have some strange plugin on Firefox that block cookies, ads or other things... You should close them and try agayn.
Hope i'll see you reply to this thread