First off, I know that I most likely would have found the answer by searching, but everytime I try to, dotnetnuke.com times out...and I have been trying for the past 6 hours.  Anyways, my DNN Scheduler is not working, it has not been working since mid June.  My users online has been at the same count for the past 2 months, no notifications are being sent.  I am running DNN 4.5.0, and have upgraded to DNN 4.5.5 thinking that it would rectify the problem, but it has not.  I have restarted the web site, IIS, WWW Services, the server...nothing seems to work.  I have changed the scheduler settings to Timed as well as Request, it does not do anything.  On the scheduler page, this is the current status:

I have manually purged the Scheduler history tables, still nothing.   Also, Next Start is always the current time, whenever I refresh the page, for all items, and it doesn't do anything.  Anyone have any idea what the problem may be?  Thanks so much in advance!!

Anyone know what the problem may be?

I finally found the solution to the problem!  The scheduler does not work if you are using Windows Authentication to log into SQL Server 2005, when I added a user to SQL Server and changed my connection string to allow for SQL Server Authentication, the Scheduler worked.