google adsense ads are not compatable with all computers slash web browsers slash programs etc

this can be problematic especially as you gain a larger pool of audience from a variety of computers many of which may not display adsense yet the people are surfing your site and hence you are loosing out on people who may click your ads

checking your sites adds and businesses on different computers and programs is extreme important and understanding where trouble arises from some flash media for instance or a script that certain web browsers cant read can greatly reduce traffic to your site that may lead you to think its your content that is bad

google analytics is not always the best because people may jump around and a questioning browser may read a prolonged visit which may be a residual open web page

to furthur complicate things slow web pages may load the content before the ads so people will out scroll the ad surface at the top of the page rendering the top heavy site worthless

other problems include deemphasis of the blog roll and difficulty in a glitch between the video matrix and the widget and typeing matrixes