This may not help at all, but make sure your search is enabled in the Host > Scheduler page.  The search index process also generates the RSS feeds.  If it is enabled, make sure that the history for the scheduled item has successful entries.

Finally, look for any errors that might appear to be related in your Admin > Event Log and report them, as they might help troubleshoot this issue.

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Will Strohl

Upendo Ventures DNN experts since 2003 Official provider of the Hotcakes Commerce Cloud and SLA support

Details regarding the last Search Engine Scheduler:
Search Engine Scheduler
Completed re-indexing content WEB20 6.063 True
S: 12/17/2010 3:02:39 AM 
E: 12/17/2010 3:02:45 AM 
N: 12/17/2010 3:02:39 PM

When I checked the Event Viewer, I had the following error which occurred during the time of the content re-indexing.

12/17/2010 3:02:42 AM   General Exception       AssemblyVersion: 5.5.1; PortalID: -1; PortalName ...
AssemblyVersion: 5.5.1
PortalID: -1
PortalName: 
UserID: -1
UserName: 
ActiveTabID: -1
ActiveTabName: 
RawURL: 
AbsoluteURL: 
AbsoluteURLReferrer: 
UserAgent: 
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: a1b0d163-421c-4c3f-b7c5-9695158781ab
InnerException: Object reference not set to an instance of an object.
FileName: 
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Modules.Reports.ReportsController.GetSearchItems
StackTrace: 
Message: System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.Reports.ReportsController.GetSearchItems(ModuleInfo ModInfo) at DotNetNuke.Services.Search.ModuleIndexer.GetSearchIndexItems(Int32 PortalID)
Source: 
Server Name: WEB20

Not sure what it means or if it's related to the problem...