Can't reply to some posts

I find that I can't reply to some small percentage of posts. When I go to the page, it says that I'm not logged in. Anyone know what's going on?

Here is an example post:
http://www.cplusplus.com/forum/general/148098/
That happens if you're using a Gecko browser and there's a post with an empty code tag.
That explains it. I'm using Firefox. Thanks.

Dave
helios, care to explain that bug?
ty
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