berto - 11:35 pm on Jan 15, 2006 (gmt 0)

In my case, link units have been disappearing on my two most lucrative pages for over a month now. (I don't run Google Analytics or Adwords.)

On my most lucrative page, link units were earning 50% of revenue for that page during the month of November.

Link units on that page essentially disappeared (with just an occasional reappearance) from early December until just a few days ago.

Link units have begun reappearing with regularity on that page recently--great!--but they are still nowhere to be seen on the other of the two highest-earning pages.