I just checked and my profile is still PR3. I checked your profile in a tool and it showed PR N/A. I don't get it. You have more than 8000 posts but your profile has no PR?
Hmm..why does it matter anyway ? the links to your site on profile page are nofollow (as like in almost every vb based forum)
Really I never knew they were no follow, that's good to know, also my pr on the profile went down to 0
Google probably devalued forum profiles' linking power since it's a common link building method of spammers.