That is a known issue (DNN-1478) in 5.6.1 when editing and updating any of the the tab settings for the top level Host page causes the PortalID of the Host Page to revert to 0 rather than being NULL as required for it to be a Host page. To confirm that this is the issue, run the following database query in SSMS or other similar tool being sure to replace dbo. with your installations databaseOwner value and DNN_ with the objectQualifier value (which may be an empty string) as defined in your web.config file:

SELECT PortalID, TabName, TabPath
FROM dbo.DNN_Tabs
WHERE TabPath Like '//Host%'

All PortalID's returned by this query should be NULL. I suspect that the one for the top-level Host page (TabPath of //Host) will be 0.

To correct you may either do so manually while in SSMS or run the following SQL to reset all Host page PortalID's to NULL:

UPDATE dbo.DNN_Tabs
   SET PortalID=Null
WHERE (TabPath Like '//Host%') and (PortalID is not Null)

Again, be sure to replace dbo. and DNN_ with your intallations databaseOwner and objectQualifier values.

This issue is marked as complete in the roadmap for DNN 5.6.2 due for release in mid-March or so.

---

Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner

I am having the same issue, all I did was change the skin. I tried the suggested fix but no luck. The Control Panel/Ribbon Bar will not link to the host top level page. I can get to the page by going to Host.aspx but all the icon are missing. If I go to the Page Management Control an click on Manage Host Tabs I also get nothing. Any Ideas?