The most likely cause of this is a problem that seem to occur in DNN 5.4.x where the upgrade process don't seem to kick off. Can you try running this in your Host/SQL dialogue?

SELECT * FROM {databaseOwner}[{objectQualifier}Lists] WHERE ListName='TimeInterval'

If it comes back with no results run this script, ticking the 'Execute as Script' box-

Declare @ModuleDefID Int

select @ModuleDefID = ModuleDefID from {databaseOwner}[{objectQualifier}ModuleDefinitions] where FriendlyName = 'Events'

INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','5','5',0,0,1,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','10','10',0,0,2,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','15','15',0,0,3,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','20','20',0,0,4,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','30','30',0,0,5,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','60','60',0,0,6,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','120','120',0,0,7,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','240','240',0,0,8,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','360','360',0,0,9,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','720','720',0,0,10,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
INSERT INTO {databaseOwner}[{objectQualifier}Lists] (ListName, Value, Text, ParentID, [Level], SortOrder, DefinitionID, Description, PortalID, SystemList, CreatedByUserID, CreatedOnDate, LastModifiedByUserID,
                       LastModifiedOnDate)
VALUES     ('TimeInterval','1440','1440',0,0,11,@ModuleDefID,'',0,0,-1,getutcdate(),-1,GETUTCDATE())
GO

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DNN MVP
Events - Get the latest version - Upgrade now!!
Feedback 6.4.2 - Now available - Give it a go!
Find us on Codeplex - DNN Events, DNN Feedback

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Requirements/Bugs - Please submit them on Codeplex

Thanks Roger, worked like a charm. I uninstalled because I had intended to just re-install 5.0.2 but then noticed there was a new version, otherwise I would have just upgraded.