Ok, here is the whole record for Host in the Tabs table (comma-separated).  Sorry for the format, it's the only way I could think to paste it.

TabID,TabOrder,PortalID,TabName,IsVisible,ParentId,Level,IconFile,DisableLink,Title,Description,KeyWords,IsDeleted,Url,SkinSrc,ContainerSrc,TabPath,StartDate,EndDate,RefreshInterval,PageHeadText,IsSecure,PermanentRedirect,SiteMapPriority,CreatedByUserID,CreatedOnDate,LastModifiedByUserID,LastModifiedOnDate,IconFileLarge,CultureCode,ContentItemID,UniqueId,VersionGuid,DefaultLanguageGuid,LocalizedVersionGuid

7,-1,NULL,Host,0,NULL,0,,0,,,,0,,NULL,NULL,//Host,NULL,NULL,NULL,NULL,0,0,0.5,NULL,NULL,1,NULL,,NULL,69,0D66FC5A-E474-4A75-9D1C-678475ACB930,CDE6AA13-28F5-4341-92F3-7881F0EC5E37,NULL,3155E8EB-1B76-4820-ABA1-D6890217AC23

I experienced this same problem with one of our DNN instances and the suggested fix did resolve the issue. This problem also seemed to break the File selection piece of the URL control. It was presenting the _default root rather than portal root.

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David O'Leary
Efficion Consulting