It can be due to the ads trying load. I suspect your member uses Internet Explorer (IE), and perhaps not the newest, updated version 7. If that is so, tell the person to update IE to the newest version.
But, better yet is using Firefox. I used to have some problems with the ads when I was using IE, sometimes even the with the latest version, but with Firefox, no problems at all.
In addition, you could pay to not have any ads.