Administrator/Moderator, I don't know why, but somehow I can't reply to this thread. The error "HTTP Error: 403 Forbidden The document you requested has been locked for a reason." is returned when I click "Preview Post" or "Submit Reply" button. (The same error occurs when I tried to edit some of my posts and to make a new thread in the Learning Japanese section.:?)
I tried to reply to click "REPLY" button on the left side.
And the post I wasn't able to edit is here. As in the post, I edited it once, nevertheless the 403 Forbidden Error was returned when I tried to edit the post again just few minutes later. The same error occured on a post probably a week or so ago, I don't remember exactly which one it was, though.
Thanks for your help, guys.
I finally identified one of the reasons for the error. Apparently, this forum refuses a post that has more than 4 embedded urls in it. But there still remains another question "why I can't edit my post". The same error reoccur on here. (URL links might concern this, too?)
EDIT:
I got it!!
1) delete a URL link in the post, 2) edit it, 3) re-add the URL, then I was able to edit my post at last!