A link to the thread in question would help, looking through your post history I cant find any closed threads and you have no sanctions on your account.
If it's one http://www.tomshardware.co.uk/answers/id-1933065/750w-fully-modular-psu-bitfenix-prodigy.html, are you not seeing the Post an Answer button below SR-71 Blackbird's post? .
If it's one http://www.tomshardware.co.uk/answers/id-1933065/750w-fully-modular-psu-bitfenix-prodigy.html, are you not seeing the Post an Answer button below SR-71 Blackbird's post? .
It would appear to be fixed now! I assume it was a firum error, as I couldn't reply to users, post an answer, or PM!