I've installed P2, and I love it. It works great for my personal blog and portfolio website - http://www.barryamundson.com
Everything works great, except I am getting duplicate posts showing up. At first it was just the test posts I had made with the AJAX posting on the front page, but it also seems to affect other posts. As time goes on there seem to be more and more duplicate posts on the site.
I have read about resolving this issue by setting the right timezone. It's set correctly, and regardless of what time zone I set, I still have this problem. I have seen others mention this, but I haven't seen it resolved
RESOLVED: Well, while I was writing this I did some troubleshooting by turning off all the plugins. and it worked. I think I resolved it - Once I disabled 'Advanced Category Excluder' Plugin the theme didn't have this problem. I'm just posting this here in case anyone else runs into this..