'All Cases' dashlet displays 0 cases

[kza]

I am using CiviCRM 4.5.4 on Wordpress 4.0.1. I have about 28 cases in CiviCase. I added the All Cases dashlet to my dashboard. At first, it displayed all of the cases, but after a few days, it only shows an error that reads "There are no Cases. Use Find Cases to expand your search." I have tried many times to refresh the dashboard, and have restarted my computer about a dozen times since this problem started. I can't figure out what I would have changed to make this dashlet break. Is it working for others? I have one colleague that it works for, and one for which it is broken, like mine. Ideas on how to fix it?

[demeritcowboy]

I believe it only shows cases with upcoming activities. Can easily test this by adding a case activity with a date in the future and see what happens.