2015-04-10 16:42:23,174 [gis][Thread:9][ERROR] DotNetNuke.Services.Exceptions.Exceptions - DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.
is this a new install or what has been changed, just before the error showed up?
Found one strange thing: I switched username as login tick for one of portal but lost ability to log in using username for all portals. Any of 30 portals now log me in using email not username.