Lithium,
It all is because of the Berkeley bandwidth problem. They've restricted the bandwidth, and so everyone trying to connect to their servers cannot get in, so Qs get backlogged on completed results, and cannot grab new ones. Same for others running SETIDRIVER or other caching programs.
So since they cannot connect, they continue to work on those WUs they have, until the cache is depleted or they finally connect to Berkeley and get more.