Check your Apache logging format (httpd.conf). The jobs running behind the tables require the "combined" format. You may be in "common" format.
The jobs are using search filters based on referrer or client UI. This causes an empty result set if your logs are in "common" format.
A simple way to test this is to try comparing the following searches in the web intelligence search window: "eventtype=pageview eventtype=ua-browser-*" vs. "eventtype=pageview". If you have no results on the first one but plenty of results for the second one, then the jobs I'm talking about are likely failing with no results.
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