Hi I have been having this exact problem for over a week. I can SOMETIMES upload one pic but certainly no more than that. I have done everything timethief has said in other help forums and this one, even uninstalled chrome which I was using, installing firefox, tried IE, changed firewalls, ran revo uninstaller to get crap off the background, I have more than 2GB space left, java and flash are up to date, temporarily deactivated plug-ins, I have no extensions, deleted browsing history and cookies, third party cookies are enabled, phew! Over the last 24 hours my computer and wifi modem have been rebooted about 10 times.
I am using the latest Mozilla Firefox installed yesterday now, as Chrome was completely uninstalled. I would prefer to just keep using that now I'm mucked around with it so much.
Mozilla/5.0 (Windows NT 6.0; rv:12.0) Gecko/20100101 Firefox/12.0
My modem is a USB wifi broadband travel thing.
I'm distressed my new blogging addiction can't be fulfilled properly!