Google actually devalued the 'juice' that a forum backlink can give well over a year ago - hence backlinks from forums didn't and don't carry as much SEO weight. Whether on not they have reduced the weight of forum links further, i've heard nothing to suggest it and nothing relational recently on Matt Cutts blog.
At the end of the day i wouldn't worry too much about it, you should be using various SEO methods to build links, not just forum - also i wouldn't stop posting to forums because of this (even if it is true) as niche forums can bring you a serious amount of well targetted traffic.
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