I've had lots of problems over the last few years with ads on different sites. They imbed so much scripts, video, java, and other junk that sometimes just clashes with something on my computer. Then a little later, everything works fine. I assume that they either found a problem and pulled the ad or it wasn't delivered in this visit. I had so many problems with one site that I sent an email to complain and they blocked certain ads to my IP address. That ended the problem. Until I went on vacation and tried to access the site (different IP address) and got the full barrage of junk again. I worked around it but it sure is annoying.
The problem is, ad delivery these days is very dynamic, targeted to individual preference. I go to ems.com to look at technical base layers and then I start getting ads from ems on the sites I visit. You look into garden tractors and start getting ads from John Deere. You don't have problems with John Deere ads but there is something flaky about EMS ads so I have problems. Same primary site visited, very different content delivered and resulting behavior.
Also, there are differences in how the different operating systems handle things like scripts, video, and Java. So Windows 7 no problem, XP hangs. It's all supposed to be seamless but it really isn't.
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