I've experienced this on many of the different Bimmerpost forums that I frequent. I use either Chrome or Firefox and have the same issue. Not sure why, because I don't have this problem on other forums that are running vBulletin.
Mine: 2006 Z4 Roadster | Interlagos Blue Metallic | Black Extended Nappa Leather | Carbon Leather Trim | Premium | Navigation | Heated Seats | iPod Adapter | Purchased 7/19/12
Hers: 2011 335is Coupe | Le Mans Blue Metallic | Black Dakota Leather | Dark Glacier Aluminum | 6MT | Premium | Convenience | Heated Seats | Navigation | Harmon Kardon | iPod/USB | European Delivery 5/12/11