If IE9 then probably not your browser. I can find vbulletin problems when IE9 was in beta, but that was almost a year ago.
IE9 means you're like using Windows 7, so should be fine.
I don't attach, but could explain how to post pics.I am having trouble editing. Also, when I attach an image, it doesn't always come out, I have to go back to edit and I have been getting a lot of double posts as a result.
Double posts are usually caused by double clicking. Maybe the response is slow so you click again?