Webmasterworld Forums discussions have pointed out that results for many sites have been reduced from a full page to one or two. A message is displayed along with the results:
In order to show you the most relevant results, we have omitted some entries very similar to the 1 already displayed.
If you like, you can " repeat the search with the omitted results included. "
If you click on this "repeat search" link, most of the pages start to show. There are many members who have experienced the same:
My site has been 'slowly leaking'
It is now Results 1 – 4 of about 1,570
i'm seeing the same thing with my site
1-1 of 350,000
If you have similar problems, join the discussions here.