I hope this is the right place to put this; I couldn't find anywhere else.

 For awhile now, I've been unable to post comments on various pages (content downloads and art, etc.).  I haven't seen a help feature or the like, so I'm posting here hoping someone can help.  When I click on "post a comment," it tells me to login and doesn't allow me to type anything in the small box shown, even if I'm already logged in.  I do so anyway, and it just takes me back to the page as if nothing happened.  Does anyone else have this problem?  Is it a bug in the system, or does that only work in certain browsers?

 This mostly isn't a problem for me, since I rarely have reason to comment, but I'd prefer being able to do so than not.